1. From the Windland Smith Rice Sudden Death Genomics Laboratory, Department of Molecular Pharmacology & Experimental Therapeutics (J.M.B., M.J.A.), Division of Pediatric Cardiology, Department of Pediatric & Adolescent Medicine (K.M.B., J.N.J., M.J.A.), Division of Pediatric Surgery, Department of Surgery (C.M.), and Division of Cardiovascular Diseases, Department of Medicine (M.J.A.), Mayo Clinic, Rochester, MN.