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