1. Department of Breast and Thyroid Surgery, The Affiliated Shapingba Hospital of Chongqing University, Chongqing 400030, P.R. China
2. Shanxi Medical University, Taiyuan, Shanxi 030607, P.R. China
3. Department of Critical Care Medicine, The Affiliated Fuling Hospital of Chongqing University, Chongqing 408099, P.R. China
4. Department of Breast and Thyroid Surgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, P.R. China