1. Division of Pediatric Cardiology, Department of Pediatric and Adolescent Medicine (J.M.B., R.K.R., M.J.A.), Mayo Clinic, Rochester, MN.
2. Department of Molecular Pharmacology and Experimental Therapeutics (Windland Smith Rice Sudden Death Genomics Laboratory) (J.M.B., M.J.A.), Mayo Clinic, Rochester, MN.
3. Istituto Auxologico Italiano, IRCCS, Center for Arrhythmias of Genetic Origin and Laboratory of Cardiovascular Genetics, Milan, Italy (L.C., S.C., F.D., P.J.S.).
4. Department of Medicine and Surgery, University of Milano-Bicocca, Italy (L.C.).
5. Istituto Auxologico Italiano, IRCCS, Department of Cardiovascular, Neural and Metabolic Sciences, San Luca Hospital, Milan, Italy (L.C.).
6. Division of Heart Rhythm Services, Department of Cardiovascular Medicine (M.J.A.), Mayo Clinic, Rochester, MN.