| Affiliation: | 1. Division of Pediatric Cardiology, Washington University School of Medicine/St. Louis Children's Hospital, , St. Louis, Missouri;2. Division of Pediatric Cardiology, University of Iowa Children's Hospital, , Iowa City, Iowa;3. Division of Pediatric Cardiology, Lucile Packard Children's Hospital at Stanford, , Palo Alto, California;4. Division of Pediatric Cardiology, Children's Hospital Colorado, , Aurora, Colorado;5. Division of Biostatistics, Washington University School of Medicine, , St. Louis, Missouri |
