1. Division of Cardiovascular Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts
2. Cardiovascular Research Center, Beth Israel Deaconess Medical Center, Boston, Massachusetts
3. Department of Exercise Science, Arnold School of Public Health, University of South Carolina, Columbia
4. Division of Cardiovascular Medicine, Vanderbilt University, Nashville, Tennessee
5. Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson
6. Human Genomics Laboratory, Pennington Biomedical Research Center, Baton Rouge, Louisiana