1. Cardiovascular Genetics Research Laboratory (J.L.T., R.S.S., T.M.O.), Mayo Clinic, Rochester, MN.
2. Division of Pediatric Cardiology, Department of Pediatric and Adolescent Medicine (J.J.H., M.Y.Q., P.W.O., T.M.O.), Mayo Clinic, Rochester, MN.
3. Division of Biomedical Statistics and Informatics, Department of Health Sciences Research (J.M.E., W.R.B.), Mayo Clinic, Rochester, MN.
4. Department of Cardiovascular Medicine (T.M.O.), Mayo Clinic, Rochester, MN.