1. Division of Maternal‐Fetal Medicine, Department of Obstetrics and GynecologyDavid Geffen School of Medicine at UCLALos AngelesCaliforniaUSA
2. Fetal Diagnostic Centers, Pasadena, Tarzana, and LancasterCaliforniaUSA
3. TomTec CorporationChicagoIllinoisUSA
4. Division of Pediatric Cardiology, Department of PediatricsUCLA Mattel Children's Hospital, David Geffen School of Medicine at UCLALos AngelesCaliforniaUSA