1. John H. Stroger, Jr. Hospital of Cook County; Department of Medicine; Chicago IL USA
2. Albany Medical College; Department of Medicine; Albany NY USA
3. Faculty of Medicine, Ain Shams University; Department of Cardiology; Cairo Egypt
4. Egyptian Center for Evidence Based Medicine (ECEBM); 8 Masaken Hayet El Tadrees Ain Shams University, El Khalifa El Maamoun St. Cairo Egypt 11646
5. Ain Shams University; Department of Obstetrics and Gynaecology, Faculty of Medicine; 16 Ali Fahmi Kamel Street Heliopolis Cairo Egypt 11351