1. Internal Medicine Department, College of Medicine, King Khalid University Medical City, Abha 61421, Saudi Arabia
2. Department of Family and Community Medicine, College of Medicine, King Khalid University, Abha 62529, Saudi Arabia
3. Department of Community Medicine, Integral University, Kursi Road, Lucknow 226026, India
4. Neurology Department, Kasr Al Ainy Hospital, Faculty of Medicine, Cairo University, Cairo 4240310, Egypt
5. Neurology Section, Department of Medicine, King Khalid University, Abha 61421, Saudi Arabia
6. Internal Medicine Department, Jazan University, Jazan 45142, Saudi Arabia