1. Division of Pediatrics, Department of Pediatrics, John H. Stroger Jr. Hospital of Cook County, 1900 W. Polk Street, Room 1134, Chicago, IL 60612, USA
2. Electrophysiology, Advocate Children’s Hospital, 440 W. 95th Street, Oak Lawn, IL 60453, USA
3. Division of Pediatric Cardiology, John H. Stroger Jr. Hospital of Cook County, 1900 W. Polk Street, Room 1123, Chicago, IL 60612, USA