Abstract
The Bender-Gestalt test (Bender test), since its appearance, has been widely used to analyze visuomotor functions, perception and cognitive processes. However, it is often used in a variety of other contexts. The aim of this research is to study the use of the Bender test and the Bender-II, based on the results of studies conducted between 2013 and 2023.
The search was carried out using inclusion and exclusion criteria and in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses. The databases consulted were Medline, Embase and SciELO (Scientific Electronic Library Online), with no language restrictions. Study selection criteria included three steps: title, abstract and full text. The heterogeneity of study results precluded meta-analysis.
Sixty-two articles were retrieved through the electronic search, and after reviewing abstracts and reading full texts, 25 articles were considered to meet our inclusion criteria. Among these, studies reveal that the Bender test is particularly useful for diagnosing neurodegenerative disorders such as dementia and Alzheimer's disease. In particular, several studies have demonstrated its effectiveness in assessing visuomotor functions and visual perception, with mixed results regarding its sensitivity and specificity. Key findings include improved detection of cognitive impairment in the early stages of Alzheimer's disease and a strong association between test performance and patients' neuropsychological status.
In conclusion, although the Bender test is widely recognized and used in various clinical populations, its use remains subject to certain limitations. The main criticism concerns subjectivity in interpreting results and the variability of scores depending on cultural factors and the age of the individual.
Keywords: bender-gestalt test, interpretation, neuropsychology, scoring, validation, visuomotor assessment, visuomotor function
Introduction and background
The visuomotor Gestalt test, better known as the Bender-Gestalt test (Bender test), has been one of the most widely used psychological assessment instruments for over half a century. Since its first publication in 1938, this test has remained a benchmark for clinicians, schoolchildren, forensic scientists and neuropsychologists, thanks to its simplicity of application and its effectiveness in assessing visuo-motor abilities. Beyond its role in cognitive and developmental assessment, the Bender test has also been used to measure personality and emotional state [1].
The Bender test is based on assessing the precision and coordination of motor responses during the manual reproduction of nine geometric figures on a blank sheet of paper. Koppitz (1964) introduced a standardized scoring system that objectifies the assessment by assigning points to errors made when copying the figures [2]. This system has shown that the test score decreases with age until it stabilizes at around zero at 12 years of age, testifying to progressive and predictable visuomotor development in children.
The geometric shapes of Bender's test are taken from a selection of 30 figures developed by Wertheimer (1923), designed to illustrate the principles of Gestalt perception. Indeed, Wertheimer emphasized the ability of individuals to respond coherently to visual stimuli, and Bender followed up his work by demonstrating that perceptual-motor delays or organic and functional pathologies could lead to abnormal test performance [3].
Despite the widespread clinical use of the Bender test, this original version has been the subject of much criticism regarding its format and norms. Indeed, researchers have pointed to the absence of a standardized format, the lack of normative data and sometimes weak construct validity, raising questions about the reliability of the results obtained. These limitations led to the development of a revised version, the Bender-II, which introduced substantial modifications to the structure and functions of this traditional test, which has been the subject of several independent publications in Anglo-Saxon literature.
This systematic review aims to synthesize research conducted between 2013 and 2023 on the Bender test and the Bender-II, highlighting their clinical applications, limitations and future research prospects.
Review
Materials and methods
This systematic review followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines to ensure the transparency and methodological rigor of the study.
Search Strategy
To include randomized controlled studies, observational studies, as well as reviews, systematic reviews, and meta-analyses related to the Bender test, the Medline (PubMed), Embase, and SciELO (Scientific Electronic Library Online) databases were searched in October 2023. The search was conducted using the Medical Subject Headings (MeSH) search, with terms such as "Bender Visual-Motor Gestalt Test" [MeSH], "Bender Test" [MeSH], "Bender Gestalt Visuomotor Test" [MeSH], and "Visual-Motor Performance Test". These terms were combined with the Boolean operators AND, OR, and NOT to refine the results.
Selection Criteria
This is a systematic review in which we included qualitative and quantitative studies that met our inclusion criteria. We considered articles published over the last decade, between 2013 and 2023, and without language restriction. All articles included in this review addressed the role of the Bender test in visuomotor and psychometric assessment in various contexts, such as neurological disorders, cognitive deficits, child neuropsychology and developmental disorders. In addition, we excluded studies and information published only in abstract form.
Due to variability in sample age, different techniques and treatments among study participants, and the discovery of non-evaluable articles, a meta-analysis was not performed.
Valuation Methods
The included studies were evaluated to assess the quality of the current literature using specific assessment tools: for clinical studies, the Jadad Scale for Randomized Controlled Trials [4]; for observational studies, the Newcastle-Ottawa Scale (NOS) [5]; and for reviews, the A MeaSurement Tool to Assess Systematic Reviews 2 (AMSTAR 2) scale [6]. A data extraction table was used to identify data relevant to the study, such as author name, year, study title, objectives, study method, groups compared, sample, consideration of confounding and bias, validity of tools and conclusions supported by results.
Results
The results of our study showed a paucity of literature addressing the role of the Bender test in visuomotor and psychometric assessment in various near-miss neonatal contexts over the last few decades, between 2013 and 2023. In fact, only 62 articles were retrieved by electronic search, and after reviewing the various abstracts and reading the full texts, 25 articles were deemed eligible, meeting our inclusion criteria (Figure 1). The quality assessment of the selected studies is presented in Table 1.
Table 1. Evaluation of studies included in the review.
| Author, year | Type of study | Relevance to this study | Clearly stated objectives | Appropriate study method | Sample | Consideration of confounding factors and biases | Validation of questions | Tables/understandable figures | Conclusions supported by the results |
| Korkmaz et al., 2023 [7] | Psychometric study | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes |
| Mufti et al., 2021 [8] | Comparative cross-sectional study | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Keppeke et al., 2022 [9] | Correlational study | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Keppeke et al., 2018 [10] | Correlational study | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Mosotho et al., 2017 [11] | Retrospective exploratory study | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Gulleroglu et al., 2013 [12] | Prospective study | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Dos Santos et al., 2014 [13] | Transcultural study | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes |
| Chan et al., 2019 [14] | Trial controll ed trial | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Chellappa et al., 2018 [15] | Cross-over experimental study randomized | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Kausar et al., 2021 [16] | Comparative study | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Haritha et al., 2024 [17] | Observational study | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Done et al., 2016 [18] | In-vivo study | Oui | Oui | Oui | Oui | Non | Oui | Oui | Oui |
| Samuel, 2020 [19] | Pilot study | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Mukherjee et al., 2018 [20] | Case study | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes |
| Kılıç et al., 2020 [21] | Pilot study | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Cunha et al., 2019 [22] | Observational study | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Cecato et al., 2020 [23] | Cross-sectional study | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Blazkova et al., 2020 [24] | Cross-sectional study | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Karami et al., 2019 [25] | Comparative study | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Thurston et al., 2022 [26] | Longitudinal study | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Kar et al., 2023 [27] | Cross-sectional study | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Blazkova et al., 2022 [28] | Cross-sectional study | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Jaszke-Psonka et al., 2016 [29] | Cohort study | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Pandey et al., 2022 [30] | Observational study | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Boostani et al., 2017 [31] | Experimental study | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Figure 1. Flowchart of the study and results selection process.
The studies gathered in this systematic review used various versions of the Bender test, including visuomotor and psychometric assessments in several contexts, such as neurological disorders, cognitive deficits, child neuropsychology and developmental disorders (Table 2).
Table 2. Comparison of characteristics and results of studies included in the review.
BGT: Bender Visual Motor Gestalt Test; BGT II: Bender Gestalt Test II; GISD B: General Intelligence and Short-Term Memory Diagnostic Battery; RCPM: Raven Colored Progressive Matrices; SPSS: Statistical Package for the Social Sciences; TNF alpha: Tumor necrosis factor alpha; ASA: American Society of Anesthesiologists classification; MMSE: Mini-Mental State Examination; BVRT: Benton Visual Retention Test; DKA: Diabetic ketoacidosis; SCA: Sudden cardiac arrest; PM2.5: Particulate matter with a diameter of fewer than 2.5 micrometers; N2O: Nitrous oxide
| Author, year | Type of study | Rating scale | Scale score | Aim of the study | Study population | Parameters analyzed | Assessment methods |
| Korkmaz et al., 2023 [7] | Psychometric study | Bender-Gestalt II (BGT II) test | Not specified | Standardize the BGT II test and evaluate its psychometric properties on a Turkish sample, while obtaining normative values. | 2691 Turkish students aged 4.0 to 17/month from various socio-economic backgrounds (low, medium, high) | Absolute agreement values for copy items, test-retest reliability coefficients for copy scores | Developmental Schedules, Colored Progressive Matrices, non-verbal intelligence test |
| Mufti et al., 2021 [8] | Comparative cross-sectional study | BGT II test | Not specified | Study neuropsychological functioning in children with and without specific learning disabilities (SLD). | 116 children in Pakistan (64 with SLD and 52 without) | Memory function, with a comparison of recall scores between the two groups | BGT II (copy, recall, perceptual, and motor test subscales), SPSS 21 analysis |
| Keppeke et al., 2022 [9] | Correlational study | Bender Visual-Motor Gestalt Test (BGT) | Not specified | Examine the correlation between visual-motor development (as measured by the BGT) and sexual maturity, according to Tanner stages. | 134 adolescents aged 10 to 15 | Visual-motor development, sexual maturity (Tanner stages), Raven scores, effects of grade repetition and developmental disorders | BGT, Raven's Progressive Matrices Test, information on sexual maturity and developmental disorders from medical records |
| Keppeke et al., 2018 [10] | Correlational study | BGT, Raven's Progressive Matrices Test | Not specified | Study the relationship between visual-motor development and pubertal changes using the Tanner scale. | 134 teenagers aged 10 to 15 | Visual-motor development and pubertal changes (Tanner stages), Raven scores, influence of schooling, repetition, and developmental problems | BGT, Raven's Progressive Matrices Test, medical data on pubertal maturity |
| Mosotho et al., 2017 [11] | Retrospective exploratory study | BGT, CT scan | Not specified | Examine the association between BGT results, CT scans and assessment of competency to stand trial and criminal responsibility. | Patient population at the Free State Psychiatric Complex (FSPC), South Africa, 2013 | Association between BGT scores (Hain) and outcomes of criminal responsibility and competency to stand trial, presence of brain damage | BGT, CT scan, demographic and clinical data from medical records |
| Gulleroglu et al., 2013 [12] | Prospective study | BGT, Cancellation Test, Visual and Auditory Number Assay Test | Not specified | Determining neurocognitive function in pediatric kidney transplant patients. | 20 kidney transplanted children (aged 6-16), with control groups of 20 healthy children and 20 with chronic renal failure | Neurocognitive functions: frequent dysfunction after transplantation | BGT, Cancellation Test, Visual and Auditory Number Assay Test |
| Dos Santos et al., 2014 [13] | Transcultural study | Bender-Gradual Scoring System (B-SPG) | Not specified | Examine the psychometric qualities of the B-SPG system for assessing perceptual-motor maturity independently of cultural context. | 231 children: three Brazilian states, 231 children aged 6 to 10, including 108 from various regions of Lima (Peru) and 123 from three Brazilian states | Perceptual-motor maturity and the influence of cultural context | Group projection of figures, correction by experienced psychologists following instructions in Portuguese and Spanish |
| Chan et al., 2019 [14] | Randomized controlled trial | BGT, Hand-eye coordination test, Cognitive function test | Not specified | Investigating the effects of interactive cognitive-motor training on hand-eye coordination and cognitive function in the elderly. | 62 elderly people, divided into experimental and control groups | Hand-eye coordination, motor sub-capacities, visual perception, cognitive function | Immediate, three-month and six-month post-test assessments |
| Chellappa et al., 2018 [15] | Randomized experimental crossover study | Sustained attention, cognitive output, information processing, visual-motor performance | Not specified | Investigating the impact of circadian misalignment on task-dependent human cognitive performance. | Individuals exposed to a night shift pattern | Sustained attention, cognitive output, visual-motor performance, sleep | Shift work paradigm with attention and performance measurement over several days |
| Kausar et al., 2021 [16] | Comparative study | BGT II | Not specified | Comparing cognitive impairment between patients with epileptic and psychogenic non-epileptic seizures. | 125 patients, including 62 with epilepsy and 63 with psychogenic non-epileptic seizures | Cognitive disorders | Application of the BGT II to assess cognitive deficits |
| Haritha et al., 2024 [17] | Observational study | Stroop test, Wisconsin Card Sorting Test (WCST), Trail Making Test-B, BGT | Not specified | Compare the incidence of postoperative cognitive decline in elderly patients undergoing open abdominal surgery under general anesthesia with isoflurane or desflurane. | 40 patients aged between 60 and 80 | Postoperative cognitive decline, biomarkers (interleukin 1, interleukin 6, TNF alpha, amyloid β, S100) | Cognitive evaluation before and after surgery with tests and blood tests |
| Done et al., 2016 [18] | In-vivo study | BGT II | Not specified | Comparing the efficacy of oral sedation with midazolam-N2O and ketamine-N2O in children during dental treatment. | 30 healthy children (3-9 years) (ASA I and II) requiring multiple tooth extractions | physiological parameters (respiratory rate, pulse rate, oxygen saturation), psychomotor performance | Physiological measurements (respiratory rate, pulse, oxygen saturation) and psychomotor test (modified BGT) |
| Samuel, 2020 [19] | Pilot study | BGT, WCST | Not specified | Investigating visuo-motor and executive functional deficits in adult patients with primary generalized epilepsy. | 30 adults, including a target group of epilepsy patients and a healthy control group | Visual-motor and executive functioning | Visual-motor and executive functioning |
| Mukherjee et al., 2018 [20] | Case study | BGT, Binet Kamat Intelligence Test (BKT) | Average of 8.6 (BGT), average IQ of 85.5 (BKT) | Investigating the relationship between the location of mutations in the DMD gene and cognitive deficits in children with Duchenne muscular dystrophy. | 10 male children aged 4 to 9 with genetic mutations | Visual-motor function, IQ, effects of mutation localization | BGT, BKT |
| Kılıç et al., 2020 [21] | Pilot study | Wechsler Intelligence Scale for Children-Revised (WISC-R), BGT | Specific subtest results: p=0.024 (image completion), p=0.001 (image arrangement) | Examining neuropsychological development in children with primary monosymptomatic nocturnal enuresis. | 30 children with nocturnal enuresis, 30 healthy children | Neuropsychological development, cognitive tests, visual-motor functioning | WISC-R, BGT |
| Cunha et al., 2019 [22] | Observational study | WISC, BGT, Auditory Processing Evaluations (APE) | APE tests and lower parental education | Study the cognitive profiles of children with SLD, with an assessment of auditory processing. | 34 children with LTC and 15 control children (ages 7-14) | Auditory processing, verbal and spatial reasoning, cognitive performance | Hearing tests (tone audiometry, acoustic immittance, brainstem evoked response), Wechsler Scale tests, BGT |
| Cecato et al., 2020 [23] | Cross-sectional study | BGT | 3.2 (healthy control group), 7.21 (AD patients), 8.04 (VD patients), p<0.0001 | Evaluating the performance of elderly people on the BGT and using error types to discriminate between healthy control groups, Alzheimer's patients and vascular dementia. | 285 elderly people (over 60, >1 year of schooling), divided into control, Alzheimer's and vascular dementia groups | BGT score differences between groups, types of execution errors | Clinical history, neuropsychological tests (BGT, CAMCOG MMSE, GDS, PFAQ), neuroimaging |
| Blazkova et al., 2020 [24] | Cross-sectional study | BGT, Raven Colored Progressive Matrices (RCPM) | No significant difference observed between the groups | Analyzing the impact of polycyclic aromatic hydrocarbons (PAHs) on the cognitive development of five-year-old children. | 169 five-year-old children from Karvina (n = 70) and Ceske Budejovice (n = 99) | PAH exposure during pregnancy and cognitive development in children (BGT, RCPM) | B[a]P and OH-PAH concentrations in air and urine, psychological tests (BGT, RCPM) |
| Karami et al., 2019 [25] | Comparative study | BGT II | Epilepsy patients scored lower than healthy controls and migraine patients lower than healthy controls | Comparing cognitive and perceptual functions in patients with occipital epilepsy, migraine patients and healthy individuals. | 93 participants (epilepsy patients, migraine sufferers and healthy controls) | Group differences (occipital epilepsy, migraine, healthy controls) on copying, recall, motor and perceptual subscales | Demographic questionnaire, BGT II |
| Thurston et al., 2022 [26] | Longitudinal study | Statistical links BGT, WCST | Statistical links between postnatal methylmercury exposure and neurodevelopmental outcomes at 9, 17, 22, and 24 years of age | Study the effects of postnatal methylmercury exposure on neurodevelopmental outcomes over a 24-year period. | 312-550 participants (Seychelles Child Development Study main cohort) | Associations between methylmercury exposure (via hair measurements) and 85 neurodevelopmental outcomes at different ages (9, 17, 22, and 24 years) | Measurements of methylmercury in hair at different ages, adjusted linear regressions |
| Kar et al., 2023 [27] | Cross-sectional study | WISC-R, GISD-B, BGT | Poorer cognitive function in children with poor metabolic control and a history of DKA | Examine the effects of age of diabetes onset, metabolic control and type of insulin regimen on neurocognitive function in children and adolescents with type 1 diabetes. | 47 children (aged 6-18), type 1 diabetes for at least five years | Intelligence (WISC-R), short-term memory (GISD-B), visual-motor perception (BGT), attention (Moxo-dCPT), hyperactivity, impulsivity | Measurement of specific neurocognitive tests (WISC-R, GISD-B, BGT, Moxo-dCPT) |
| Blazkova et al., 2022 [28] | Cross-sectional study | BGT, RCPM | Links between prenatal oxidation and cognitive performance | Studying the impact of oxidative damage linked to PM2.5 particles during the prenatal period on the cognitive development of children at five years of age. | Five-year-old children, n = 169, born in 2013 and 2014, living in Karvina (polluted area) and Ceske Budejovice (control area) | Prenatal PM2.5 levels, oxidation biomarkers in urine and plasma (8- oxodG, 15-F2t-IsoP), cognitive tests | Measurement of PM2.5 levels during 3rd trimester of pregnancy, cognitive tests (BGT and RCPM) |
| Jaszke-Psonka et al., 2016 [29] | Cohort study | MMSE, Digit Span Test, BGT, BVRT | Disparities in cognitive function between study and control groups | To assess the incidence and severity of cognitive deficits in survivors of SCA compared with those who suffered a myocardial infarction without SCA and a healthy control group. | Cardiac arrest survivors (n = 30), MI survivors without ACS (n = 31), healthy control group (n = 30) | Incidence of cognitive deficits, duration of cardiac arrest | Cognitive tests (MMSE, Digit Span, BGT, BVRT) |
| Pandey et al., 2022 [30] | Observational study | Pulse oximeter, BGT, Electric pulp tester | Physiological, psychomotor and analgesic changes | Assessing variations in physiological, psychomotor and analgesic parameters during nitrous oxide (N2O) titration in children aged 3 to 12 years. | 100 children aged 3 to 12 | Oxygen saturation, heart rate, pain and psychomotor performance | Oximeter, BGT, electrical pulpometer test |
| Boostani et al., 2017 [31] | Experimental study | BGT (digitized) | Classification accuracy | Developing a quantitative method for diagnosing obsessive-compulsive disorder (OCD) using the drawing characteristics of the BGT. | 50 OCD patients under treatment, 50 control subjects | Drawing characteristics such as pen angle, speed, curvature and pressure | Optical pen, digital tablet, Hidden Markov Model (HMM), Multilayer Perceptron Model (MLP) |
Discussion
The results of this systematic review of studies on the use of the Bender test highlight its wide application in various fields, including neuropsychology, psychiatry and cognitive disorders, as well as its growing role in cognitive aging research. This tool remains central to the assessment of cognitive and neuropsychological disorders, particularly after traumatic events such as stroke or head injury [32].
In addition to its use in cognitive disorders, the Bender test also finds applications in the assessment of developmental disorders, such as autism spectrum disorder (ASD) and attention deficit hyperactivity disorder (ADHD). Studies show that the performance of children suffering from these disorders is often impaired on the Bender test, particularly in areas such as motor planning and visual memory. However, some researchers point out that this test, while effective in some areas of cognitive assessment, does not capture the full complexity of developmental disorders, particularly those related to social and behavioral aspects. In addition, the Bender test plays a key role in the study of cognitive aging, particularly in the context of neurodegenerative disorders such as Alzheimer's disease [23].
Despite its many applications, the Bender test has certain limitations that can affect the accuracy of the assessment. It seems less sensitive for detecting mild cognitive deficits, particularly in the early stages of cognitive impairment. In addition, external factors such as stress, fatigue or the patient's emotional state at the time of assessment may influence performance, raising concerns about the validity of the results. These factors underline the importance of a holistic assessment and contextual interpretation of Bender test results, in order to compensate for its limitations and maximize its relevance in clinical practice [33].
Strengths and Implications of the Study
The study has several strengths, including its adherence to the PRISMA 2020 guidelines, which ensures methodological rigor and transparency in the research process. It provides a comprehensive analysis of the Bender test in various clinical settings, including neurological disorders and cognitive deficits. A major strength lies in the use of rigorous quality assessment tools, ensuring the reliability of the included studies. However, the review highlights the paucity of recent publications on the topic, which represents both a limitation and an opportunity for future research. The practical implications of this review highlight the need for better standardization of assessment practices and increased exploration of the Bender test in lesser-studied populations. This paves the way for future studies that could fill these gaps and refine the application of this test in diverse settings.
Conclusions
The Bender test remains a fundamental tool in neuropsychological assessment, providing crucial information on patients' visuospatial abilities and cognitive perception. Its use is well documented in a number of clinical fields, including the assessment of neurocognitive disorders, developmental disorders and cognitive aging. It has demonstrated its effectiveness in the diagnosis of neurological and psychiatric disorders, such as after a stroke or head injury, and in pathologies such as ASD and ADHD. However, its sensitivity to mild cognitive disorders and variability influenced by socio-cultural and educational factors necessitate cautious and often complementary use with other diagnostic tools.
The growing use of the Bender test in the context of cognitive aging and neurodegenerative disorders, particularly Alzheimer's disease, shows its potential for the early detection of these pathologies. However, to maximize its effectiveness, it needs to be integrated into a broader neuropsychological test battery. Future research should focus on adapting the test to specific populations and improving its cultural validity, in order to optimize its usefulness in monitoring cognitive disorders over time.
Disclosures
Conflicts of interest: In compliance with the ICMJE uniform disclosure form, all authors declare the following:
Payment/services info: All authors have declared that no financial support was received from any organization for the submitted work.
Financial relationships: All authors have declared that they have no financial relationships at present or within the previous three years with any organizations that might have an interest in the submitted work.
Other relationships: All authors have declared that there are no other relationships or activities that could appear to have influenced the submitted work.
Author Contributions
Concept and design: Hicham Lafhal, Ahami Omar Tohami Ahami, Kawtar Chafik, Siham Goutou, Rochdi Atmane
Acquisition, analysis, or interpretation of data: Hicham Lafhal, Ahami Omar Tohami Ahami, Rochdi Atmane
Drafting of the manuscript: Hicham Lafhal, Ahami Omar Tohami Ahami, Kawtar Chafik, Siham Goutou, Rochdi Atmane
Critical review of the manuscript for important intellectual content: Hicham Lafhal, Ahami Omar Tohami Ahami, Rochdi Atmane
Supervision: Hicham Lafhal, Ahami Omar Tohami Ahami, Kawtar Chafik, Siham Goutou, Rochdi Atmane
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