1. Family Medicine Department, Faculty of Medicine, Port Said University, Egypt
2. Internal Medicine Department, Faculty of Medicine, Suez Canal University, Egypt
3. Faculty of Medicine, Alexandria University, Egypt
4. Alexandria Medical Center (AMC), Alexandria, Egypt
5. Universidad de San Martín de Porres Facultad de Medicina Humana, Peru
6. Department of Public Health, Community, Environmental and Occupational, Faculty of Medicine, Suez Canal University, Egypt
7. Department of Basic Medical Sciences, Faculty of Medicine, King Salman International University, South Sinai, Egypt
8. Lebanese University, Beirut, Lebanon
9. SUNY Upstate Medical University, Syracuse, NY.