1. Department of Endocrine and Breast Surgery, The First Affiliated Hospital of Chongqing Medical University , Chongqing 400016 , China
2. Department of Thyroid and Breast Surgery, Affiliated Hospital of North Sichuan Medical College , Nanchong, Sichuan 637000 , China
3. Department of Hepatobiliary & Pancreatic Surgery, The First Affiliated Hospital, Zhejiang University , Hangzhou 310003 , China
4. Department of General Surgery, People's Hospital of Linshui County , Sichuan 638500 , China