1. Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Epidemiology, Nutrition and Toxicology Research Institute Maastricht (NUTRIM), Maastricht University, Maastricht, The Netherlands.
3. Devision of Nutritional Epidemiology, The National Institute of Environmental Medicine, Karolinska Institute, Stockholm, Sweden.
4. Department of Obstetrics and Gynecology, Seoul National University Bundang Hospital, Seongnam, Korea.
5. Department of Obstetrics and Gynecology, Ewha Womans University College of Medicine, Seoul, Korea.
6. Major in Biomodulation, World Class University, Seoul National University, Seoul, Korea.