1. Geisinger Health System; Division of Maternal Fetal Medicine, Women's Health Service Line; 100 N Academy Ave Danville PA USA 17822
2. National Center for Child Health and Development; Department of Health Policy; 2-10-1 Okura, Setagaya-ku Tokyo Japan 157-8535
3. Sidney Kimmel Medical College at Thomas Jefferson University; Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology; 834 Chestnut Street Suite 400 Philadelphia Pennsylvania USA PA 19107