1. Maternal Fetal Care Center, Boston Children's Hospital Harvard Medical School Boston MA USA
2. Department of Radiology Boston Children's Hospital, Harvard Medical School Boston MA USA
3. Division of Maternal–Fetal Medicine, Department of Obstetrics & Gynecology Beth Israel Deaconess Medical Center, Harvard Medical School Boston MA USA
4. Department of Pathology Beth Israel Deaconess Medical Center, Harvard Medical School Boston MA USA