1 Department of Health Management and Economics, School of Public Health, Tehran University of Medical Sciences, Tehran ; School of Public Health, Kurdistan University of Medical Sciences, Sanandaj, Iran.
2 Department of Epidemiology and Biostatistics, School of Public Health, Isfahan University of Medical Sciences, Isfahan, Iran.
3 Minimally Invasive Surgery Research Center, Iran University of Medical Sciences, Isfahan, Iran ; Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.