Affiliation: | 1Cancer Research Chair, College of Medicine, King Saud University, Riyadh, Saudi Arabia.2Primary Health care department, High Institute of Public Health, Alexandria University, Egypt.3Family and Community Medicine, College of Medicine, King Saud University, Riyadh, Saudi Arabia.4Medical Interns, College of Medicine, King Saud University, Riyadh Saudi Arabia.5Medical Interns, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia. |