1. Perinatology Research Branch, NICHD/NIH/DHHS, Bethesda, MD, and Detroit, MI, USA,
2. Department of Obstetrics and Gynecology, Seoul National University Bundang Hospital, Gyeonggi-do, Republic of Korea,
3. Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor, MI, USA,
4. Department of Epidemiology and Biostatistics, Michigan State University, East Lansing, MI, USA,
5. College of Biomedical Science, Kangwon National University, Chuncheon, Republic of Korea,
6. Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, MI, USA,
7. Medical Research Collaborating Center, Seoul National University Bundang Hospital, Gyeonggi-do, Republic of Korea,
8. Department of Pathology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea,
9. Department of Pathology, Asan Medical, Center University of Ulsan College of Medicine, Seoul, Republic of Korea, and
10. Department of Pathology, Haeundae Paik Hospital, Inje University College of Medicine, Busan, Republic of Korea