1. Department of Cardiovascular Medicine, University of Texas Medical Branch, Galveston, Texas, USA
2. Division of Cardiology, Rhode Island Hospital, Brown Medical School, Providence, Rhode Island, USA
3. Division of Cardiovascular Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA
4. Division of Internal Medicine, Houston Medical Center, Warner Robbins, Georgia, USA
5. Department of Internal Medicine, Rochester General Hospital, Rochester, New York, USA
6. Department of Cardiovascular Medicine, University of Missouri Kansas City, Kansas City, Missouri, USA
7. Division of Cardiovascular Medicine, University of Washington, Seattle, Washington, USA
8. Department of Cardiovascular Medicine, Ain Shams University, Cairo, Egypt
9. Department of Cardiovascular Medicine, University of Kentucky, Lexington, Kentucky, USA
10. Division of Cardiovascular Medicine, Baylor School of Medicine, Houston, Texas, USA