1. Department of Obstetrics and Gynecology, College of Medicine, Hanyang University, Seoul, Korea.
2. Department of Microbiology, College of Medicine, Yeungnam University, Daegu, Korea.
3. Department of Pathology, College of Medicine, Yeungnam University, Daegu, Korea.
4. Department of Pathology, College of Medicine, Hanyang University, Seoul, Korea.