1. Scientific Research Center, Medical Service Department (MSD), Ministry of Defence, Riyadh, Saudi Arabia
2. Adult Cardiology, Prince Sultan Cardiac Center, Medical Service Department (MSD), Ministry of Defence, Riyadh, Saudi Arabia
3. Department of Biochemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
4. Department of Surgery, Prince Sultan Military Medical City, Medical Service Department (MSD), Ministry of Defence, Riyadh, Saudi Arabia
5. Department of Psychiatry, Prince Sultan Military Medical City, Medical Service Department (MSD), Ministry of Defence, Riyadh, Saudi Arabia
6. Dermatology Department, Medical Service Department (MSD), Ministry of Defence, Riyadh, Saudi Arabia
7. Department of ENT, Prince Sultan Military Medical City, Medical Service Department (MSD), Ministry of Defence, Riyadh, Saudi Arabia
8. Department of Dentistry, Prince Sultan Military Medical City, Medical Service Department (MSD), Ministry of Defence, Riyadh, Saudi Arabia
9. Prince Sultan Military College of Health Science, Dhahran, Saudi Arabia