1. Department of Breast Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, 107 Yanjiangxi Road, Guangzhou 510120, China
2. Department of Breast Surgery, Guangdong Hospital of Traditional Chinese Medicine, Traditional Chinese Medicine University of Guangzhou, 111 Dade Road, Guangzhou 510120, China
3. Department of Hepatic Surgery, The Third Affiliated Hospital, Sun Yat-sen University, 600 Tianhe Road, Guangzhou 510630, China
4. Department of Medical Statistics and Epidemiology, School of Public Health, Sun Yat-sen University, 74 Zhongshaner Road, Guangzhou 510080, China