1. Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, CA, USA
2. Stanford Cardiovascular Institute, 300 Pasteur Dr H2170, Stanford, CA 94305, USA
3. Stanford Sports Cardiology, Stanford University, Stanford, CA, USA
4. Research Unit Hypertension and Cardiovascular Epidemiology, Department of Cardiovascular Sciences, University of Leuven, Kapucijnenvoer 35 blok d - box 7001 3000 Leuven, Belgium
5. Department of Clinical Physiology, Linköping University, SE-581 83 Linköping, Sweden
6. Department of Medical and Health Sciences, Linköping University, SE-581 83 Linköping, Sweden
7. Department of Genetics, Stanford University School of Medicine, Stanford, CA, USA
8. Division of Cardiology, Veterans Affairs Palo Alto Healthcare System and Stanford University, 3801 Miranda Avenue, Palo Alto, CA 94304, USA
9. Department of Medicine, Stanford Center for Clinical Research, 300 Pasteur Dr, Stanford, CA 94305, USA