1. Department of Internal Medicine, University of California, Davis, Genome and Biomedical Science Facility (N.C.).
2. Division of Cardiology, Department of Medicine, Duke University Medical Center, Durham, NC (C.F.-M.).
3. Division of Cardiovascular Medicine, Vanderbilt University Medical Center, Nashville, TN (S.T.S.).
4. Department of Pediatrics, Division of Cardiology, Washington University School of Medicine, St Louis, MO (J.N.A.S.).
5. Division of Cardiology, Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York (E.Y.W.).