1. Department of Cardiology, Lehigh Valley Healthcare Network, Allentown, PA 18103, USA
2. Department of Medicine, Einstein Medical Center, Philadelphia, PA 19141, USA
3. Division of Cardiology, Allegheny General Hospital, Pittsburgh, PA 15212, USA
4. Department of Cardiology, Holy Cross Hospital, Silver Springs, MD 20910, USA
5. Heart Center of Nevada, Las Vegas, NV 89106, USA
6. Division of Cardiology, Einstein Medical Center, Philadelphia, PA 19141, USA