Atlas of ultrasound in obstetrics and gynecology a multimedia reference / Peter M. Doubilet, MD, PhD, Professor of Radiology, Harvard Medical School, Senior Vice Chair of Radiology, Brigham and Women's Hospital, Boston, Massachusetts, Carol B. Benson, MD, Professor of Radiology, Harvard Medical School, Director of Ultrasound and Co-Director of High-Risk, Obstetrical Untrasound, Brigham and Women's Hospital, Boston, Massachusetts, Beryl R. Benacerraf, MD, Professor of Obstetrics, Gynecology, and Reproductive Biology, Harvard Medical School, Department of Radiology, Brigham and Women's Hospital, Consulting Staff, Department of Obstetrics and Gynecology, Brigham and Women's Hospital, Boston, Massachusetts.