1. Department of Medicine West Virginia University Morgantown West Virginia USA
2. Section of Electrophysiology, Division of Cardiovascular Medicine University of California San Diego La Jolla California USA
3. Department of Medicine Washington Hospital Health Care System Fremont California USA
4. Cardiovascular Disease Section University of Oklahoma Health Sciences Center Oklahoma City Oklahoma USA
5. Department of Medicine Guthrie Health System/Robert Packer Hospital Sayre Pennsylvania USA
6. Department of Cardiovascular Medicine Allegheny General hospital Pittsburgh Pennsylvania USA
7. Department of Medicine John H. Stroger Cook County Hospital Chicago Illinois USA
8. Division of Cardiology Johns Hopkins School of Medicine Baltimore Maryland USA
9. Department of Cardiovascular Medicine Mayo Clinic Rochester Minnesota USA