1. Department of Medicine, Northwestern University, Feinberg School of Medicine, Chicago, IL, USA
2. Department of Cardiology, The First Hospital of China Medical University, Shenyang, Liaoning Province, China
3. Department of Medicine, Section of Cardiac Electrophysiology, Lewis Katz School of Medicine at Temple University, Philadelphia, PA, USA
4. Department of Medicine, Division of Cardiology, University of California, 500 Parnassus Avenue, Millberry Union East Room 429, San Francisco, CA, USA
5. Department of Medicine, Division of Cardiology, San Francisco VAMC, San Francisco, CA, USA
6. Department of Surgery, Division of Adult Cardiothoracic Surgery, University of California, San Francisco, CA, USA