1. Division of Pediatric Cardiology; Children's Hospital of Pittsburgh of UPMC; Pittsburgh PA USA
2. Womack Army Medical Center; Fort Bragg NC USA
3. Division of Pediatric Cardiology; Medical University of South Carolina Children's Hospital; Charleston SC USA
4. Division of Pediatric Cardiology; Duke Children's Hospital and Health Center; Durham NC USA
5. Clinical and Translational Research; University of Pittsburgh; Pittsburgh PA USA