1. Department of Community Medicine, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
2. Department of Orthopedic Surgery, Bone and Joint Diseases Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
3. Department of Epidemiology and Biostatistics, School of Health, Mashhad University of Medical Sciences, Mashhad, Iran