1. Catholic Research Institutes of Medical Science, The Catholic University of Korea College of Medicine, Seoul, Korea.
2. Department of Obstetrics and Gynecology, The Catholic University of Korea College of Medicine, Seoul, Korea.
3. Department of Obstetrics and Gynecology, The Catholic University of Korea College of Medicine, Daegu, Korea.
4. Department of Chemistry, Kangwon University, Gangwondo, Korea.