1Department of Global Public Health, Karolinska Institute, Stockholm, Sweden
2Alimentary Tract Research Center, Imam Khomeini Hospital Clinical Research Development Unit, Department of Biostatistics and Epidemiology, School of Public Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
3Liver and Pancreatobiliary Diseases Research Center, Digestive Diseases Research Institute, Tehran University of Medical Sciences, Tehran, Iran
4Digestive Disease Research Center, Digestive Disease Research Institute, Tehran University of Medical Sciences, Tehran, Iran
5Hearing Research Center, Department of Biostatistics and Epidemiology, School of Public Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
6Behbahan Faculty of Medical Sciences, Behbahan, Iran
7School of Medicine, Dezful University of Medical Sciences, Dezful, Iran
8Shoshtar Faculty of Medical Sciences, Shoshtar, Iran
9Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
10Abadan Faculty of Medical Sciences, Abadan, Iran
11Clinical Research Development Unit, School of Medicine, Alimentary Tract Research Center, Imam Khomeini Hospital, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
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