1. Department of Medical Technology, Kobe Tokiwa University, 6-2 2 chome, Ohtanicho, Nagataku, Hyogo, Kobe 653-0838, Japan
2. Department of Cytopathology and Gynecology, Osaka Cancer Prevention and Detection Center, Osaka 536-8588, Japan
3. Department of Obstetrics and Gynecology, Japanese Red Cross Kyoto Daiichi Hospital, Kyoto 605-0981, Japan