1. Division of CardiologyDepartment of PediatricsThe Children’s Hospital of Philadelphia and Perelman School of Medicine at the University of PennsylvaniaPhiladelphiaPAUSA
2. Department of Medicine and the Center for Clinical Epidemiology and BiostatisticsPerelman School of Medicine at the University of PennsylvaniaPhiladelphiaPAUSA
3. Westat Biostatistics and Data Management CoreThe Children’s Hospital of PhiladelphiaPhiladelphiaPAUSA