1. Department of Clinical Nutrition, Soonchunhyang University Bucheon Hospital, Bucheon, Korea.
2. Department of Preventive Medicine, Soonchunhyang University College of Medicine, Cheonan, Korea.
3. Department of Obstetrics and Gynecology, Soonchunhyang University College of Medicine, Bucheon, Korea.
4. Department of Biostatistics, Clinical Trial Center, Soonchunhyang Unversity Bucheon Hospital, Bucheon, Korea.