1. Center for Cardiac Arrhythmias of Genetic Origin and Laboratory of Cardiovascular Genetics, Istituto Auxologico Italiano, IRCCS , Via Pier Lombardo, 22, 20135 Milan , Italy
2. Department of Cardiovascular Medicine, Division of Heart Rhythm Services (Windland Smith Rice Genetic Heart Rhythm Clinic), Mayo Clinic , Rochester, MN , USA
3. Department of Pediatric and Adolescent Medicine, Division of Pediatric Cardiology, Mayo Clinic , Rochester, MN , USA
4. Department of Molecular Pharmacology & Experimental Therapeutics (Windland Smith Rice Sudden Death Genomics Laboratory), Mayo Clinic , Rochester, MN , USA