1. Faculty of Medicine, Tanta University, Tanta, Egypt
2. Faculty of Medicine, The Hashemite University, Zarqa, Jordan
3. Department of Internal Medicine, McLaren Health Care, Flint, Michigan, USA
4. Department of Internal Medicine, Michigan State University, East Lansing, Michigan, USA
5. Faculty of Medicine, Jordan University of Science and Technology, Irbid, Jordan
6. Faculty of Medicine, Minia University, Minia, Egypt
7. Department of Cardiology, West Virginia University, Morgantown, West Virginia, USA