1. Division of Pediatric Cardiology Monroe Carell Jr. Children's Hospital at Vanderbilt Nashville TN USA
2. Division of Pediatric Cardiology C.S. Mott Children's Hospital Ann Arbor MI USA
3. Carnegie Mellon University Pittsburgh PA USA
4. Division of Pediatric Cardiology The Hospital for Sick Children Toronto ON Canada
5. Division of Pediatric Cardiology University of Texas Southwestern Medical Center Dallas TX USA