1. Center for Genomic Medicine and Division of Cardiology, Department of Medicine, Massachusetts General Hospital, Boston (A.V.K.).
2. Cardiovascular Disease Initiative, Broad Institute of MIT and Harvard, Cambridge, MA (A.V.K.).
3. Department of Medicine, Harvard Medical School, Boston, MA (A.V.K.).
4. Departments of Medicine and Biochemistry and Robarts Research Institute, Schulich School of Medicine and Dentistry, Western University, London, Canada (R.A.H.).