1. From the Department of Family and Community Medicine, College of Medicine, King Saud University and KSU Research Chair of Epidemiology and Public Health, Riyadh, Saudi Arabia
2. Correspondence: Dr. Awatif Alam · Department of Family and Community Medicine (34), College of Medicine, King Saud University, PO Box 2925, Riyadh 11461, Saudi Arabia · aalam@ksu.edu.sa