1. Department of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia;
2. Department of Psychiatry, King Abdulaziz University, Jeddah, Saudi Arabia;
3. Department of Psychiatry, Zagazig University, Zagazig, Egypt;
4. Department of Psychiatry, Duke University Medical Center, Durham, North Carolina, USA;
5. School of Public Health, Ningxia Medical University, Yinchuan, PR China