1. Department of Obstetrics, Gynecology and Reproductive Sciences; Yale University School of Medicine; New Haven CT USA
2. Department of OB/GYN; College of Human Medicine; Michigan State University; Grand Rapids MI USA
3. Department of OB/GYN; Institute of Women's Life Medical Science; Yonsei University College of Medicine; Seoul Korea
4. Department of Pediatrics; Yale School of Medicine; New Haven CT USA
5. Perinatology Research Branch; Eunice Kennedy Shriver National Institute of Child Health and Human Development; NIH; DHHS; Detroit MI USA