1. Department of Breast Surgery, The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong 510630, P.R. China
2. School of Clinical Medicine, Guilin Medical University, Guilin, Guangxi Zhuang Autonomous Region 541001, P.R. China
3. Department of Thyroid and Breast Surgery, Nanxishan Hospital of Guangxi Zhuang Autonomous Region, Guilin, Guangxi Zhuang Autonomous Region 541002, P.R. China
4. 4Department of Gastrointestinal Surgery, The First Affiliated Hospital of Jinan University; Guangzhou, Guangdong 510630, P.R. China