1. Departments of Gynecology and Obstetrics ,China–Japan Friendship Hospital
2. Department of Pathology, China–Japan Friendship Hospital, Beijing, China
3. Department of Gynecology and Obstetrics, Changping Hospital of Chinese and Western Medicine, Beijing, China
4. Department of Medicine and Molecular Science, Gunma University, Maebeshi, Japan
5. Department of Gynecology Oncology, University of Chicago, Chicago, IL, USA
6. Department of Gynecology and Obstetrics, China–Japan Friendship Hospital, Beijing, China