1 Department of Gynecology, The First People's Hospital of Hangzhou, Nanjing Medical University, Hangzhou, China.
2 Department of Gynecology, The First People's Hospital of Hangzhou, Nanjing Medical University, Hangzhou, China. Electronic address: attendingsun@sina.com.
3 Department of Pathology, The First People's Hospital of Hangzhou, Nanjing Medical University, Hangzhou, China.