1. Department of Microbiology, College of Medicine, Yeungnam University, 170 Hyeonchung-ro, Namgu, Daegu 705-717, Republic of Korea
2. Department of Pathology, College of Medicine, Yeungnam University, 170 Hyeonchung-ro, Namgu, Daegu 705-717, Republic of Korea
3. Department of Obstetrics and Gynecology, College of Medicine, Hanyang University Hospital, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, Republic of Korea