1. Division of Maternal‐Fetal Medicine, Department of Obstetrics and GynecologyDavid Geffen School of Medicine at UCLA Los Angeles California USA
2. Fetal Diagnostic Centers, Pasadena, Tarzana, and Lancaster California USA
3. Division of Cardiology, Department of Pediatrics, Children's Hospital ColoradoUniversity of Colorado School of Medicine Aurora Colorado USA
4. TomTec Corporation Chicago Illinois USA
5. Division of Pediatric Cardiology, Department of Pediatrics, UCLA Mattel Children's HospitalDavid Geffen School of Medicine at UCLA Los Angeles California USA