1. Department of Pathology, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Pathology, Ewha Woman's University College of Medicine, Seoul, Korea.
3. Department of Family Medicine, Yonsei University College of Medicine, Seoul, Korea.
4. Department of General Surgery, Yonsei University College of Medicine, Seoul, Korea.
5. Department of Obstetrics and Gynecology, Yonsei University College of Medicine, Seoul, Korea.