1. Pregnancy Research Branch, NICHD/NIH/DHHS, Bethesda, MD, USA
2. Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, MI, USA
3. Department of Obstetrics and Gynecology, Busan Paik Hospital, Inje University College of Medicine, Busan, Republic of Korea
4. Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea
5. Division Director of Maternal-Fetal Medicine, Mount Carmel Health System, Columbus, OH, USA
6. Department of Obstetrics and Gynecology, College of Medicine Tucson, University of Arizona, Tucson, AZ, USA