1. Internal Medicine Department, Faculty of Medicine, Fayoum University, Fayoum, Egypt
2. Internal Medicine Departments, Faculty of Medicine, Cairo University, Cairo, Egypt
3. Community Department, Faculty of Medicine, Cairo University, Cairo, Egypt
4. Clinical and Chemical Pathology Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
5. Anesthesia & ICU Department, Faculty of Medicine, Alazhar University, Cairo, Egypt
6. Internal Medicine Departments, Faculty of Medicine, Ain Shams University, Cairo, Egypt