1. Department of Gynecology and Obstetrics, West China Second Hospital of Sichuan University, Chengdu 610041, People's Republic of China.
2. Sichuan Medical Science Academy, Sichuan Provincial Hospital, Chengdu 610041, People's Republic of China.
3. State Key Laboratory of Biotherapy of Human Diseases, West China Hospital of Sichuan University, Chengdu 610041, People's Republic of China.