1. Department of Gynecology, College of Clinical Medicine, Dali University, Dali, Yunnan, China
2. The Second People’s Hospital of Yibin, Yibin, Sichuan, China
3. Health Commission of Dali, Longshan District, Dali, Yunnan, China
4. Department of Surgery, College of Clinical Medicine, Dali University, Dali, Yunnan, China.