Affiliation: | a Department of Epidemiology and Biostatistics, College of Public, Health, King Saud bin Abdulaziz University for Health Sciences, P.O Box 22490 Riyadh 11426 Kingdom of Saudi Arabiab Population Health Research Section, King Abdullah International Medical, Research Center, P.O Box 22490 Riyadh 11426 Kingdom of Saudi Arabiac Department of Surgery, King Abdulaziz Medical City, National Guard, Health Affairs, P.O Box 22490 Riyadh 11426 Kingdom of Saudi Arabiad Ministry of Health, P.O Box 22490 Riyadh 11426 Kingdom of Saudi Arabiae King Saud University, P.O Box 22490 Riyadh 11426 Kingdom of Saudi Arabia |