1. Division of Zuckerberg San Francisco General, Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California San Francisco, San Francisco, California, USA.
2. University of California San Francisco School of Medicine, San Francisco, California, USA.
3. Division of Maternal-Fetal Medicine, Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California San Francisco, San Francisco, California, USA.