1. Department of Internal Medicine, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
2. Department of Epidemiology, Faculty of Health, Mashhad University of Medical Sciences, Mashhad, Iran
3. Metabolic Syndrome Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
4. Islamic Azad University, Mashhad Branch, Mashhad, Iran
5. Department of Biostatistics, Faculty of Health, Mashhad University of Medical Sciences, Mashhad, Iran