1. Health Research Center, Life Style Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
2. Health Education Department, Faculty of Health, Baqiyatallah University of Medical Sciences, Tehran, Iran
3. Department of Epidemiology and Biostatistics, Baqiyatallah University of Medical Sciences, Tehran, Iran
4. Department of Medicine, Nephrology Division, Director, Renal Dialysis Unit, King Abdulaziz University, Jeddah, Saudi Arabia
5. Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, North Carolina; King Abdulaziz University, Jeddah, Saudi Arabia; and Ningxia Medical University, Yinchuan, China