Affiliation: | 1.Department of Biostatistics, Faculty of Paramedical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran ;2.Department of Biostatistics, Faculty of Health, Kermanshah University of Medical Sciences, Kermanshah, Iran ;3.Epidemiology of Biostatistics Unit, Rheumatology Research Center, Tehran University of Medical Sciences, Tehran, Iran ;4.Department of Neurology, School of Medicine Imam Reza Hospital, Kermanshah University of Medical Sciences, Kermanshah, Iran ;5.Obstetrics and Gynecology, Department of Obstetrics and Gynecology, School of Medicine, Motazedi Hospital Kermanshah University of Medical Sciences, Kermanshah, Iran ;6.Department of Biostatistics, School of Public Health & Health Sciences, University of Massachusetts, Amherst, MA, USA ;7.Research Center for Environmental Determinants of Health, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran ; |