1Department of Women’s Health Educational System, Hokkaido University School of Medicine, Hokkaido University, Sapporo, 0608638 Japan
2Department of Obstetrics and Gynecology, Hokkaido University School of Medicine, Hokkaido University, Sapporo, 0608638 Japan
3Department of Gynecology, State Key Laboratory of Oncology in South China, Sun Yat-Sen University Cancer Center, 510060 Guangzhou, China
4Faculty of Medicine, Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong China
5Department of Pathology and Laboratory Medicine, University of Tennessee Health Science Center, Memphis, TN 38163 USA
6Center for Cancer Research, University of Tennessee Health Science Center, Memphis, TN 38163 USA
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