Saber Yezli1, Badriah M Alotaibi2, Abdulaziz A Bin Saeed3. 1. Global Centre for Mass Gatherings Medicine, Public Health Directorate, Ministry of Health, Riyadh, 11176, Saudi Arabia. Electronic address: saber.yezli@gmail.com. 2. Global Centre for Mass Gatherings Medicine, Public Health Directorate, Ministry of Health, Riyadh, 11176, Saudi Arabia. 3. Global Centre for Mass Gatherings Medicine, Public Health Directorate, Ministry of Health, Riyadh, 11176, Saudi Arabia; Department of Family and Community Medicine, College of Medicine, Kind Saud University, Riyadh, Saudi Arabia.