1. Division of Pediatric Cardiology; Kaiser Permanente; Roseville; CA; USA
2. Division of Pediatric Cardiology; Children's Hospital Los Angeles; Los Angeles; CA; USA
3. Division of Pediatric Cardiology; Harbor-UCLA Medical Center; Torrance; CA; USA
4. Division of Pediatric Cardiology; David Geffen School of Medicine at UCLA; Los Angeles; CA; USA