1. Global Centre for Mass Gatherings Medicine, Ministry of Health, Riyadh, Saudi Arabia
2. Biostatistics, Epidemiology and Scientific Computing Department, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
3. Experimental Medicine Department, King Abdullah International Medical Research Center/King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
4. Department of Biostatistics and Bioinformatics, King Abdullah International Medical Research Center/King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
5. Department of Emergency Medicine, College of Medicine, King Saud University, Riyadh, Saudi Arabia