Affiliation: | 1. Obstetrics and Gynecology, David Geffen School of Medicine at UCLA, Center for Fetal Medicine and Women's Ultrasound, Los Angeles, CA, USA;2. Stanford University School of Medicine, Lucile Packard Children's Hospital at Stanford, Stanford, CA, USA;3. 1T48 Ultrasound, BC Women's Hospital, University of British Columbia, Vancouver, British Columbia, Canada |