1. Seoul Clinical Laboratories, Yongin, Korea.
2. Department of Laboratory Medicine and Research Institute of Bacterial Resistance, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Obstetrics and Gynecology, Yonsei University Wonju College of Medicine, Wonju, Korea.
4. Department of Laboratory Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.