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Systematic Review
Revised

Prevalence of Frey syndrome following extraoral surgical treatment for mandibular fractures: a systematic review and meta-analysis

[version 2; peer review: 2 approved]
PUBLISHED 30 Nov 2023
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Abstract

Our study aims to estimate the prevalence of Frey syndrome following open reduction and internal fixation (ORIF) for mandibular fractures. Two reviewers independently conducted a systematic literature search in the Medline and Scopus databases. The pooled prevalence with 95% confidence intervals (CI) was estimated, and quality assessment, outlier analysis, and influential analysis were performed. In total, fifteen eligible studies were included in this meta-analysis. One study was identified as critically influential. The overall prevalence of Frey syndrome following extraoral surgical treatment for mandibular fractures was estimated as 0.01% (95%CI 0%-0.7%) with moderate heterogeneity observed between studies. In the meta-regression analysis with continuous variables, no statistically significant association was observed. Despite the relatively low prevalence, the impact of Frey syndrome on affected individuals should not be underestimated. Additional research will provide a more comprehensive understanding of the underlying factors contributing to Frey syndrome, leading to improved preventive measures and treatment strategies. A better grasp of the prevalence and associated risk factors will aid in the development of guidelines to minimize the occurrence of this syndrome.

Keywords

Frey syndrome;mandibular fractures;open reduction and internal fixation;ORIF;prevalence;meta-analysis

Revised Amendments from Version 1

Only minor changes were made to the original text, specifically to the study's strengths and limitations section. However, all of the reviewer's comments were carefully considered, and in cases where no changes were made, detailed explanations were provided.

See the authors' detailed response to the review by Andrea Frosolin
See the authors' detailed response to the review by Sadi Memiş

Introduction

Mandibular fractures, a prevalent form of facial trauma, often necessitate surgical intervention.1 Such fractures can result from a range of causes2,3 and are more frequently observed in middle-aged males.4 The condyle is the most commonly affected site, constituting a significant proportion of all mandibular fractures. In many instances, these fractures can lead to life-threatening complications like airway blockage and significant bleeding.5 Consequently, it is crucial to promptly identify and treat such cases. Commonly, the management of mandibular fractures is conducted within the confines of hospital facilities, typically undertaken by surgical specialists with relevant expertise in this domain (e.g., oral and maxillofacial surgeons (OMFS), torhinolaryngologists or other medical specialities). Treatment approaches encompass closed reduction or surgical intervention via intraoral or extraoral methods.2,3,5,6 Despite being widely esteemed as an efficacious and secure procedure, open reduction and internal fixation (ORIF) introduces significant intricacies, prominently including inferior alveolar nerve (IAN) impairment, surgical site infection (SSI), exposure of osteosynthesis material, temporomandibular joint issues, risk for hemorrhage, Frey syndrome, soft or hard tissue necrosis, malocclusion, and other complications.711

Frey syndrome (which is named after Łucja Frey) arises from an unusual reinnervation process following damage to the auriculotemporal nerve. This nerve, a branch originating from the trigeminal nerve, consists of parasympathetic fibers that regulate saliva production in the parotid gland, as well as sympathetic fibers that control the sweat glands on the face and scalp. Injuries resulting from surgical interventions such as, parotidectomy, facelifts, ORIF for mandibular fractures, as well as infections and traumas, can lead to damage in the parasympathetic and sympathetic nerve fibers of the auriculotemporal nerve within the parotid region. This, in turn, triggers an aberrant regrowth of post-ganglionic parasympathetic nerve fibers responsible for the production of saliva. These regenerated fibers deviate from their normal course and follow the existing sympathetic pathways towards the blood vessels and sweat glands of the skin, ultimately leading to the onset of Frey syndrome. Individuals afflicted with Frey syndrome commonly exhibit indications such as facial warmth, flushing, and perspiration, particularly occurring during meals, within the region influenced by the auriculotemporal nerve. This encompassed area consists of the skin, the ear, the temporal region, the scalp, and the temporomandibular joint.12,13 Frey syndrome diagnosis relies on patient history (subjective approach), while verification can be achieved using objective techniques like the Minor starch-iodine test or infrared thermography. The starch-iodine test involves applying iodine to the surgically affected area, followed by the application of dry starch after the iodine dries. Upon introducing a salivary stimulus, the presence of iodine and sweat causes the starch to change color to blue/brown. Thermography is a method for diagnosing Frey’s syndrome with a quantitative thermal difference between operated and unoperated facial regions1315

The prevalence of Frey syndrome subsequent to extraoral surgical treatment for mandibular fractures exhibits significant heterogeneity across scientific publications. Consequently, the primary aim of the present investigation is to provide a more accurate assessment of the occurrence of Frey syndrome following ORIF, through a meta-analysis of the existing data found in the scientific literature.

Methods

Search strategy

The Medline (PubMed search engine) and Scopus database searches were conducted in a thorough manner, adhering to the guidelines set by the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA),16 ensuring a meticulous and rigorous approach as depicted in Figure 1. The PRISMA checklist was utilized to facilitate the systematic review process. Articles published up until May 1st, 2023, were collected. An independent literature search was conducted by two reviewers using the following keywords: “mandibular”, “mandible”, “jaw”, “fractures”, “open reduction and internal fixation”, “ORIF”, “surgical treatment”, “Frey syndrome”, “Baillarger’s syndrome”, “gustatory hyperhidrosis”, “auriculotemporal syndrome”, “Dupuy syndrome”, “prevalence”, “incidence”, “rate”. In conjunction with the primary search, a thorough examination of the reference lists from the identified studies was conducted to identify any additional articles that may have been overlooked. The collected studies were meticulously organized and stored utilizing the Zotero reference management software (version 6.0.26).17 The credibility of our dataset was ensured by diligently removing any duplicate references. Following the initial search, the remaining articles were thoroughly examined by two independent investigators. The study selection process comprised two distinct stages. Initially, the titles and abstracts of the articles were meticulously reviewed, leading to the elimination of those not meeting the predetermined inclusion criteria. In the second stage, the full texts of the remaining articles were obtained and subjected to a comprehensive evaluation. Any disagreements during the study selection were resolved through consensus among the team members, ensuring a consistent and unified decision-making process. By employing this systematic approach, a comprehensive and dependable collection of studies for analysis was achieved.

729df2c0-7530-4c78-aa86-3aaffca9df4f_figure1.gif

Figure 1. Flow chart illustrating the organized presentation of outcomes derived from the identification and choice of pertinent research studies.

Criteria for study selection and data extraction

Articles that specifically investigated the prevalence of Frey syndrome following surgical interventions through extraoral incision for mandibular fractures were included with no restriction on publication date. Excluded from consideration were case reports, case series involving fewer than five participants, review papers, systematic reviews, meta-analysis, randomized or non-randomized clinical trials, studies involving animals, studies lacking complete text, articles not in English language, studies regarding other approaches (intraoral),18 articles examining Frey syndrome per fracture and articles containing data derived from surveillance databases. The subsequent factors were extracted from each study: the name of the primary author, publication year, research design, geographical region of origin, country of origin, study duration, overall number of patients, percentage of male participants, mean age, and individuals experiencing postoperative Frey syndrome.

Quality assessment

To evaluate the quality of the studies included, two investigators independently assessed them using the National Heart, Lung, and Blood Institute (NHLBI) Quality Assessment tool for Observational Cohort and Cross-Sectional Studies. The evaluation process entailed a thorough examination of each study to identify any methodological or survey implementation weaknesses that could impact internal validity. During the assessment, the investigators considered 14 specific questions to gauge the quality of each study. They were provided with response options such as “yes,” “no,” “cannot determine” (e.g., in instances where the data presented uncertainties or contradictions), “not reported” (e.g., in cases where data were not reported or were incomplete), or “not applicable” (e.g., when a question did not pertain to the specific type of study under evaluation). By evaluating these questions, the investigators categorized the risk of bias for each study as either “low,” “moderate,” or “high,” enabling an overall assessment of the study’s quality.19 By conducting this rigorous quality appraisal, our aim was to ensure that only studies demonstrating a moderate or high level of internal validity were included in our analysis.

Statistical analysis

Using RStudio software (version: 2022.12.0+353) by RStudio Team (2022),20 a meta-analysis was executed. The meta-analysis, facilitated by the metafor package,21 involved estimating the pooled prevalence and its associated 95% confidence intervals (CI) using the DerSimonian and Laird random-effects model, complemented by a Freeman-Tukey double arcsine transformation.22 The existence of heterogeneity among studies was assessed by visually examining the forest plot and employing Cochran’s Q statistic along with its corresponding p-value. The Higgins I2 statistic, accompanied by its 95% CI, was employed to quantify the extent of genuine heterogeneity in effect sizes. An I2 value falling within the ranges of 0%-40%, 30%-60%, 50%-90%, and 75%-100% denoted insignificant, moderate, substantial and considerable heterogeneity, respectively. To determine if the potential outlying effect sizes were also influential, screening for externally studentized residuals with z-values larger than two in absolute value and leave-one-out diagnostics were performed.23 Due to a paucity of data regarding categorical variables, such as surgeon’s level, subgroup analysis was not performed. In the conducted meta-regression analysis involving continuous variables, an investigation was carried out to assess the influence of publication year and the proportion of male participants as moderators impacting the relevant effect sizes. Due to the limited availability of data on additional continuous variables like the mean age of the patients, the analysis was performed using the aforementioned ones.24 Unless otherwise stipulated, the statistical significance was established at p = 0.05 (two-tailed). Methods designed to assess publication bias, including Egger’s test25 and Begg’s test26 along with the utilization of funnel plots, were originally formulated within the framework of comparative data. These methods operate under the assumption that studies with positive outcomes are more likely to be published than those with negative outcomes. Nevertheless, in a meta-analysis centered on proportions, the criteria for defining a positive result lacks clarity and consensus.27 Consequently, in this current meta-analysis, an evaluative approach was adopted to qualitatively assess potential publication bias.

Results

Results and characteristics of the included studies

In aggregate, this analysis encompassed a grand total of 15 studies, collectively involving a cohort of 622 participants. These publications spanned the period from 2000 to 2020, encapsulating research carried out between 1990 and 2019. Among these studies, one adopted a cohort design,42 while the remaining were cross-sectional in nature.2841 Geographically, the studies were primarily executed across Asia (including India, Japan, Turkey, and Nepal), followed by Europe (including Italy, France, Austria, and Switzerland), and finally America (including the USA and Canada). The representation of male participants averaged at 79.9%, and the mean age of participants ranged from 27 to 41.5 years, with a median age of 29.2 years. The assessment of study quality consistently categorized all the studies as being of moderate quality. Their detailed characteristics are outlined in Table 1.

Table 1. Descriptive characteristics of the included studies.

AuthorYear of publicationStudy designContinent of originCountryStudy periodTotal patientsProportion of males (%)Mean age (years)Frey syndromeQuality assessment
Ellis E.282000cross-sectionalAmericaUSA1990-19979381.7NA0Moderate
Narayanan V.292009cross-sectionalAsiaIndiaNA31NANA0Moderate
Croce A.302010cross-sectionalEuropeItalyNA1384.6331Moderate
Benech A.312011cross-sectionalEuropeItaly2006-20081471.4330Moderate
Bindra S.322011cross-sectionalAsiaIndiaNA1010031.60Moderate
Ebenezer V.332011cross-sectionalAsiaIndia2008-201020NANA0Moderate
Rao J.K.D.342013cross-sectionalAsiaIndiaNA15100NA0Moderate
Yabe T.352013cross-sectionalAsiaJapan1997-20121471.428.60Moderate
Bouchard C.362014cross-sectionalAmericaCanada2003-20121087535.61Moderate
Spinzia A.372014cross-sectionalEuropeItaly2003-20112572272Moderate
Zrounba H.382014cross-sectionalEuropeFrance2005-201014175351Moderate
Aslan C.392016cross-sectionalAsiaTurkey2012-20142466.734.60Moderate
Pau M.402016cross-sectionalEuropeAustria2012-20154276.2NA0Moderate
Bruneau S.412017cross-sectionalEuropeSwitzerland2007-2015438641.50Moderate
Koirala U.422020cohortAsiaNepal2016-20192979.329.80Moderate

Prevalence of Frey syndrome following extraoral surgical treatment for mandibular fractures

A random-effects model analysis yielded an initial overall Frey syndrome prevalence following ORIF of 0.01% (95%CI 0%-0.59%) with moderate between studies heterogeneity I2=0% (95%CI 0%-44%, p=0.84). The influence diagnostics and the forest plot illustrating the results of the leave-one-out analysis is presented in Figures 2 and 3. As per them, the study conducted by Zrounba et al.38 identified as influential. After the exclusion of the aforementioned study the estimated prevalence was calculated at 0.01% (95%CI 0%-0.7%) with moderate remaining between-studies heterogeneity I2=0% (95%CI 0%-47%) (p=0.79) (Figure 4).

729df2c0-7530-4c78-aa86-3aaffca9df4f_figure2.gif

Figure 2. Visual representation of the influence diagnostics for each of the included studies regarding the prevalence of Frey syndrome after ORIF for mandibular fractures.

729df2c0-7530-4c78-aa86-3aaffca9df4f_figure3.gif

Figure 3. Forest plot displaying the re-calculated pooled effects, with one study omitted each time, using the leave-one-out method.

729df2c0-7530-4c78-aa86-3aaffca9df4f_figure4.gif

Figure 4. Forest plot evaluating the calculated prevalence of Frey syndrome following extraoral surgical treatment for mandibular fractures.

Meta-regression analysis

The meta-regression analysis, which employed continuous variables, unveiled that there exists no statistically significant relationship, whether positive or negative, between the year of publication and the proportion of males. This outcome is visually represented in the Table 2.

Table 2. Meta-regression analysis.

VariableKQMRegression coefficientp-value
Year of publication140.660.003 (95%CI -0.004-0.01)0.42
Proportion of males120.16-0.001 (95%CI -0.008-0.005)0.58

Discussion

To the extent of our awareness this study represents the first attempt to evaluate the prevalence of Frey syndrome subsequent to extraoral surgical management of mandibular fractures using a systematic review. Hence, there exists a lack of published data that can be utilized for comparison with our estimation. According to the results of this study, the prevalence was calculated at 0.01% (95%CI 0%-0.7%) with moderate between-studies remaining heterogeneity. The type of surgery and other potential risk factors such as prolonged operative time, patients’ age, gender, fracture pattern, follow-up duration and additional procedures performed may influence the prevalence of Frey syndrome following ORIF for mandibular fractures. Understanding these sources of heterogeneity is crucial for interpreting the prevalence estimate and generalizing the findings to diverse clinical settings. Furthermore, notable heterogeneity is anticipated in the prevalence and incidence estimations owing to the nature of this investigation, stemming from variations in the temporal and geographical contexts of the included studies. As a result, a substantial I2 value within the context of proportional meta-analysis should not automatically indicate data inconsistency.27

The prevalence rate indicates that while Frey syndrome is a relatively uncommon complication, it should still be considered as a potential postoperative outcome following these procedures. Healthcare providers should be aware of the potential risk and actively assess patients for the development of symptoms associated with Frey syndrome during follow-up visits. Early detection and appropriate management strategies can help improve patient outcomes and minimize the impact of this complication on their quality of life. Despite the relatively low prevalence, the impact of Frey syndrome on affected individuals should not be underestimated. Gustatory sweating can cause significant discomfort, embarrassment, and social implications for patients.12,14 Therefore, it is essential for healthcare providers to educate patients about the potential risks and consequences associated with this complication. Furthermore, appropriate counseling and support should be provided to individuals who develop Frey syndrome to help them cope with the condition effectively. Treatment options for Frey syndrome are focused on symptom management and enhancing patients’ quality of life. These options encompass both medical and surgical interventions. Among medical approaches, such as the application of alcohol through topical injection, scopolamine administration, the utilization of glycopyrrolate, and the application of botulinum toxin A, have been proposed and extensively employed for the management of Frey’s syndrome. Notably, botulinum toxin A is among the most frequently utilized treatment modalities.43 The collaborative efforts of healthcare professionals from diverse disciplines ensure that individuals with Frey syndrome receive comprehensive and specialized care. This multidisciplinary approach allows for a comprehensive assessment of the condition and enables the development of tailored treatment plans.44

The estimated prevalence rate presented in our study could potentially serve as a valuable benchmark for guiding future research endeavors and informing clinical decision-making processes. Despite the relatively low prevalence, the impact of Frey syndrome on affected individuals should not be underestimated. Given the complexity of this phenomenon, there remains a notable avenue for further investigations aimed at delving into the intricate mechanisms that contribute to the emergence of Frey syndrome subsequent to ORIF procedures for mandibular fractures. Moreover, a distinct need arises for studies that concentrate on formulating preventive strategies and identifying effective management alternatives tailored to patients who are at an elevated risk of encountering Frey syndrome. The outcomes of such endeavors hold the potential to significantly enhance patient well-being and treatment outcomes in a tangible manner.

Study’s strengths and limitations

The principal strength of the present study is grounded in the methodological approach employed throughout its entirety. However, it is essential to acknowledge the presence of several limitations within this study. Notably, the moderate level of unaccounted heterogeneity present among the included studies does introduce a degree of caution when interpreting the results. As previously noted, the intrinsic nature of this specific study category inherently gives rise to expected outcome variations, thus contributing to the observed moderate heterogeneity. Additionally, irrespective of study nature, potential confounding factors can introduce bias to estimated Frey syndrome prevalence after ORIF for mandibular fractures. These factors (e.g., extended operative durations, patient age, additional concurrent procedures) underline the need for nuanced consideration of the study’s findings. An attempt was made to conduct a subgroup analysis involving variables such as the localization of mandibular fractures or the specific type of extraoral approaches used, with the intention of enhancing the study’s depth. Practical challenges arising from the intricacies of information within each study necessitated a thorough evaluation of potential trade-offs. Opting for a broader scope with the available data was deemed imperative to maintain the overall integrity and statistical robustness of the study. This decision was made to prevent compromising the reliability and statistical power of the study, recognizing that excluding these studies could have had adverse effects.

Furthermore, the inclusion of solely English-language observational studies led to the emergence of reporting bias.

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Kostares E, Kostares M, Kostare G and Kantzanou M. Prevalence of Frey syndrome following extraoral surgical treatment for mandibular fractures: a systematic review and meta-analysis [version 2; peer review: 2 approved]. F1000Research 2023, 12:1153 (https://doi.org/10.12688/f1000research.140994.2)
NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article.
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ApprovedThe paper is scientifically sound in its current form and only minor, if any, improvements are suggested
Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit.
Not approvedFundamental flaws in the paper seriously undermine the findings and conclusions
Version 2
VERSION 2
PUBLISHED 30 Nov 2023
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Reviewer Report 14 Dec 2023
Sadi Memiş, Kocaeli University, İzmit, Turkey 
Approved
VIEWS 5
Providing information about the fractures in which mandibular region and which extra-oral approaches resulted in Frey Syndrome would have made the study more valuable. However, the authors clearly stated why they could not use these data in the "Study's strengths ... Continue reading
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Memiş S. Reviewer Report For: Prevalence of Frey syndrome following extraoral surgical treatment for mandibular fractures: a systematic review and meta-analysis [version 2; peer review: 2 approved]. F1000Research 2023, 12:1153 (https://doi.org/10.5256/f1000research.159391.r227122)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
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14
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Reviewer Report 30 Nov 2023
Andrea Frosolin, University of Siena, Siena, Italy 
Approved
VIEWS 14
The article is ... Continue reading
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CITE
HOW TO CITE THIS REPORT
Frosolin A. Reviewer Report For: Prevalence of Frey syndrome following extraoral surgical treatment for mandibular fractures: a systematic review and meta-analysis [version 2; peer review: 2 approved]. F1000Research 2023, 12:1153 (https://doi.org/10.5256/f1000research.159391.r227121)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
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PUBLISHED 14 Sep 2023
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Reviewer Report 24 Nov 2023
Sadi Memiş, Kocaeli University, İzmit, Turkey 
Not Approved
VIEWS 35
The study contains some shortcomings and issues that need to be corrected:
  1. Under the heading "Abstract"; it is recommended that you share quantitative data in parentheses showing your statistical result (meta-regression value, p value etc.). "In
... Continue reading
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CITE
HOW TO CITE THIS REPORT
Memiş S. Reviewer Report For: Prevalence of Frey syndrome following extraoral surgical treatment for mandibular fractures: a systematic review and meta-analysis [version 2; peer review: 2 approved]. F1000Research 2023, 12:1153 (https://doi.org/10.5256/f1000research.154405.r218204)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
  • Author Response 30 Nov 2023
    Evangelos Kostares, Microbiology, National and Kapodistrian University of Athens, Athens, Greece
    30 Nov 2023
    Author Response
    On behalf of all authors, we would like to thank you for your kind words and valuable input regarding our manuscript.  Please find a point-to-point response to each of your ... Continue reading
COMMENTS ON THIS REPORT
  • Author Response 30 Nov 2023
    Evangelos Kostares, Microbiology, National and Kapodistrian University of Athens, Athens, Greece
    30 Nov 2023
    Author Response
    On behalf of all authors, we would like to thank you for your kind words and valuable input regarding our manuscript.  Please find a point-to-point response to each of your ... Continue reading
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39
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Reviewer Report 13 Oct 2023
Andrea Frosolin, University of Siena, Siena, Italy 
Approved
VIEWS 39
I read with interest your SR-MA about mandibular fractures and the prevalence of Frey syndrome following open reduction and internal fixation (ORIF).

Just some minor revisions:
  • Consider rephrasing this sentence for clarity: "Despite being
... Continue reading
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CITE
HOW TO CITE THIS REPORT
Frosolin A. Reviewer Report For: Prevalence of Frey syndrome following extraoral surgical treatment for mandibular fractures: a systematic review and meta-analysis [version 2; peer review: 2 approved]. F1000Research 2023, 12:1153 (https://doi.org/10.5256/f1000research.154405.r211992)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
  • Author Response 17 Jan 2024
    Evangelos Kostares, Microbiology, National and Kapodistrian University of Athens, Athens, Greece
    17 Jan 2024
    Author Response
    I sincerely appreciate your thoughtful review and valuable suggestions for improvement. Thank you for taking the time to provide insightful feedback.
    Kind regards,
    The corresponding author
    Competing Interests: The authors declare no competing interests.
COMMENTS ON THIS REPORT
  • Author Response 17 Jan 2024
    Evangelos Kostares, Microbiology, National and Kapodistrian University of Athens, Athens, Greece
    17 Jan 2024
    Author Response
    I sincerely appreciate your thoughtful review and valuable suggestions for improvement. Thank you for taking the time to provide insightful feedback.
    Kind regards,
    The corresponding author
    Competing Interests: The authors declare no competing interests.

Comments on this article Comments (0)

Version 2
VERSION 2 PUBLISHED 14 Sep 2023
Comment
Alongside their report, reviewers assign a status to the article:
Approved - the paper is scientifically sound in its current form and only minor, if any, improvements are suggested
Approved with reservations - A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit.
Not approved - fundamental flaws in the paper seriously undermine the findings and conclusions
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