1. Division of Pediatric Cardiology; Children's Hospital Los Angeles; Los Angeles CA USA
2. Keck School of Medicine; University of Southern California; Los Angeles CA USA
3. Division of Pediatric Cardiology; Kaiser Permanente; Roseville CA USA
4. Division of Pediatric Cardiology; Harbor-UCLA Medical Center; Torrance CA USA
5. Division of Maternal Fetal Medicine, Department of Obstetrics & Gynecology, Keck School of Medicine; University of Southern California; Los Angeles CA USA
6. Division of Pediatric Cardiology; David Geffen School of Medicine at UCLA; Los Angeles CA USA