1. Department of Pediatrics; Division of Pediatric Cardiology; University of Virginia; Charlottesville Va USA
2. Department of Pediatrics; Tulane University; New Orleans La USA
3. Department of Pediatrics; Division of Pediatric Cardiology; Mayo Clinic Foundation; Rochester Minn USA
4. Department of Pediatrics; Division of Pediatric Cardiology; Rainbow Babies and Children's Hospital; Case Western Reserve University School of Medicine; Cleveland Ohio USA