Affiliation: | 1. eResearch Technology Inc, Philadelphia, PA, USA;2. PPD Inc, Wilmington, NC, USA;3. AliveCor Corporation, San Francisco, CA, USA;4. Windland Smith Rice Comprehensive Sudden Cardiac Death Program, Divisions of Heart Rhythm Services and Pediatric Cardiology, Departments of Cardiovascular Medicine, Pediatric and Adolescent Medicine, and Molecular Pharmacology & Experimental Therapeutics, Mayo Clinic, Rochester, MN, USA |