1. Center for Arrhythmia Prevention, Brigham and Women's Hospital and Harvard Medical School, Boston, MA
2. Division of Preventive Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA
3. Department of Nutrition, Harvard T.H. Chan School of Public Health, Boston, MA
4. Division of Cardiology, University of Alberta, Edmonton, Canada
5. Cardiovascular Division, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA