Tehran University of Medical Sciences - Digestive Disease Research Center, Tehran University of Medical Sciences - Liver and Pancreaticobiliary Disease Research Center, Tehran University of Medical Sciences - Digestive Disease Research Center, University of Birmingham, Morgan State University, Tehran University of Medical Sciences - Digestive Disease Research Center, Tehran University of Medical Sciences - Digestive Disease Research Center, Tehran University of Medical Sciences - Digestive Disease Research Center, Tehran University of Medical Sciences - Digestive Disease Research Center, Tehran University of Medical Sciences - Digestive Disease Research Center, Tehran University of Medical Sciences - Liver and Pancreatobiliary Diseases Research Center, Tehran University of Medical Sciences - Digestive Disease Research Center, Tehran University of Medical Sciences - Digestive Disease Research Center, Tehran University of Medical Sciences - Digestive Disease Research Center, Isfahan University of Medical Sciences, Isfahan University of Medical Sciences, Isfahan University of Medical Sciences - Isfahan Cardiovascular Research Cente, Golestan University of Medical Sciences, Golestan University of Medical Sciences - Cancer Research Center, World Health Organization (WHO), Government of the United States of America - Division of Cancer Epidemiology and Genetics, Mount Sinai Health System - Department of Medicine, University of Birmingham - Institute of Applied Health Research, University of Birmingham - Institute of Applied Health Research, University of Birmingham - Institute of Applied Health Research and Tehran University of Medical Sciences - Digestive Disease Research Center