1. Division of Cardiology and Sports Cardiology BC, University of British Columbia, Vancouver, BC V6T2B5, Canada
2. Massachusetts General Hospital Division of Cardiology, Boston, MA 02114, USA
3. Cardiovascular Performance Program, Boston, MA 02114, USA
4. Department of Cardiology, Lausanne University Hospital (CHUV), CH-105 Lausanne, Switzerland
5. Institute for Sport Science, University of Lausanne (ISSUL), CH-105 Lausanne, Switzerland
6. Department of Family Medicine and Center for Sports Cardiology, University of Washington, Seattle, WA 98195, USA
7. Department of Orthopedics and Rehabilitation, University of Wisconsin Madison, Madison, WI 53705, USA
8. Division of Cardiology, Duke Heart Center, Duke Clinical Research Institute, Duke University School of Medicine, Durham, NC 27710, USA