1 Baylor College of Medicine, Section of Critical Care Medicine and Cardiology, Texas Children's Hospital, Houston, Texas.
2 Division of Neonatal and Developmental Medicine, Stanford University School of Medicine, Lucile Packard Children's Hospital, Palo Alto, California.
3 Medical University of South Carolina, Divison of Pediatric Cardiology, Shawn Jenkins Children's Hospital, Charleston, South Carolina.
4 Stanford School of Medicine, Division of Cardiology, Lucile Packard Children's Hospital, Palo Alto, California.
5 Northwestern University Feinberg School of Medicine, Division of Neonatology, Pediatric Pulmonary Hypertension Program, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois.
6 Mayo Clinic College of Medicine and Science, Department of Anesthesiology and Pediatric Critical Care Medicine, Mayo Eugenio Litta Children's Hospital, Rochester, Minnesota.
7 University of California San Francisco School of Medicine, Division of Critical Care, University of California San Francisco Benioff Children's Hospital, San Francisco, California.