1. Department of Radiation Oncology, Gachon Gil Medical Center, Incheon, Korea.
2. Department of Obstetrics and Gynecology, Gachon Gil Medical Center, Incheon, Korea.
3. Department of Internal Medicine, Gachon Gil Medical Center, Incheon, Korea.
4. Department of Biochemistry and Molecular Biology, Seoul National University College of Medicine, Seoul, Korea.