1. Perinatology Research Branch, Program for Perinatal Research and Obstetrics, Division of Intramural Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, NIH, Bethesda, MD and Detroit, MI, USA,
2. Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor, MI, USA,
3. Department of Epidemiology and Biostatistics, Michigan State University, East Lansing, MI, USA,
4. Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, MI, USA,
5. Integrata Verona, Ostetricia Ginecologia, Azienda Ospedaliera Universitaria, Verona, Italy,
6. Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul, Korea,
7. Department of Pathology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea, and
8. Department of Pathology, College of Medicine Inje University, Haeundae Paik Hospital, Busan, Democratic People's Republic of Korea