1. Department of Obstetrics and Gynecology, University of California, Irvine, Orange, CA, USA
2. Department of Gynecology and Obstetrics, Johns Hopkins University, Baltimore, MD, USA
3. Perinatal Center of Savannah, Savannah, GA, USA
4. Department of Women’s Health Services, Southern California Permanente Medical Group, Irvine, CA, USA
5. Miller Children’s Hospital and Long Beach Memorial Medical Center, Long Beach, CA, USA