1. Department of Obstetrics and Gynecology, Kaiser Permanente, Santa Clara, NC, USA
2. Department of Obstetrics and Gynecology, Division of Maternal Fetal Medicine, University of California, Los Angeles, CA, USA
3. Department of Urology, University of California, Los Angeles, CA, USA
4. Center for Fetal Medicine and Women’s Ultrasound, Los Angeles, CA, USA