?:authorAffiliation
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[\'School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Systematic Review and Meta-analysis Expert Group (SRMEG), Universal Scientific Education and Research Network (USERN), Tehran, Iran.\', \'Gastroenterology & Liver Diseases Research Center, Research Institute for Gastroenterology & Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran.\', \'Basic & Molecular Epidemiology of Gastrointestinal Disorders Research Center, Research Institute for Gastroenterology & Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Electronic address: hamid.asadzadeh@sbmu.ac.ir.\']
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