1. Section of Pediatric Cardiology Department of Pediatrics Comer Children's Hospital and the Pritzker School of Medicine of the University of Chicago Chicago Illinois USA
2. Section of Pediatric Cardiology Department of Pediatrics West Virginia University School of Medicine Morgantown West Virginia USA
3. Division of Pediatric Cardiology Department of Pediatrics Children's Hospital of Michigan Central Michigan University Detroit Michigan USA
4. Center for Arrhythmia Care Heart and Vascular Center Pritzker School of Medicine of the University of Chicago Chicago Illinois USA