1. From the Department of Medicine, Division of Internal Medicine (K.Y.K.), Department of Pediatric and Adolescent Medicine, Division of Pediatric Cardiology (J.M.B.), Department of Medicine, Division of Cardiovascular Diseases (N.S.A., S.L.M., S.R.O.), Department of Pediatric and Adolescent Medicine, Division of Pediatric Cardiology (M.J.A.), and Department of Medicine, Division of Cardiovascular Diseases (M.J.A.), Mayo Clinic, Rochester, MN.