1. Cancer Research Institute, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
2. Department of Obstetrics and Gynecology, Zhujiang Hospital, Southern Medical University, Guangzhou 510280, P.R. China
3. Department of Vascular Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
4. Institute of Pathology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, Chongqing, Sichuan 400038, P.R. China