1. Department of General Surgery, Dalang Hospital, Dongguan, Guangdong, P.R. China
2. Affiliated Dongguan Hospital Southern Medical University (Dongguan People’s Hospital) Dongguan Guangdong, Guangdong, P.R. China
3. Department of Hepatic-Biliary-Pancreatic Surgery, The Affiliated Hospital of Guizhou Medical University, Guiyang, P.R. China