1 Department of Hepatobiliary and Pancreatic Surgery, The Affiliated Hospital of Yunnan University, The Second People's Hospital of Yunnan Province, Kunming, Yunnan Province, China.
2 Department of General Surgery, The First People's Hospital of Kunming, Kunming, Yunnan Province, China.
3 Department of Hepatobiliary and Pancreatic Surgery, The Affiliated Hospital of Yunnan University, The Second People's Hospital of Yunnan Province, Kunming, Yunnan Province, China. Electronic address: xsrsyby@sohu.com.