1. Department of Obstetrics and Gynecology, Hanyang University Guri Hospital, Hanyang University College of Medicine, Guri, Korea.
2. Department of Pathology, Hanyang University Guri Hospital, Hanyang University College of Medicine, Guri, Korea.
3. Department of Pathology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
4. Department of Pathology, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea.
5. Department of Biomedical Laboratory Science, Mokpo Science University, Mokpo, Korea.
6. Department of Clinical Laboratory Science, Ansan University, Ansan, Korea.