1. Division of Pediatric Cardiology; Department of Pediatrics; NewYork Presbyterian/Morgan Stanley Children's Hospital; Columbia University Irving Medical Center; New York New York
2. Division of Cardiology; Department of Pediatrics; The Children's Hospital of Philadelphia; Philadelphia Pennsylvania
3. Department of Biostatistics and Epidemiology; The University of Pennsylvania; Philadelphia Pennsylvania
4. Department of Medicine; Penn Cardiovascular Institute; Perelman School of Medicine; Philadelphia Pennsylvania