1. Division of Cardiology and Center for Pediatric Clinical Effectiveness, The Children’s Hospital of Philadelphia, Department of Pediatrics, Leonard Davis Institute, and Center for Cardiovascular Outcomes, Quality, and Evaluative Research, The Perelman School of Medicine at The University of Pennsylvania, Philadelphia, PA, (M.L.O.).
2. Division of Cardiology, Departments of Pediatrics and Epidemiology & Biostatistics, UCSF Benioff Children’s Hospital, San Francisco, CA (S.P.).