1. Hepatobiliary and Pancreatic Surgery; Liaoning Cancer Hospital and Institute; Shenyang 110042 China
2. Department of General Surgery; the First People's Hospital of Jinzhou District in Dalian City; Dalian 116100 China
3. Department of Laparoscopic Surgery; the First Affiliated Hospital of Dalian Medical University; Dalian 116001 China
4. Department of Neurology; the First Affiliated Hospital of Dalian Medical University; Dalian 116001 China
5. Department of Oncology; Zhongshan Hospital of Dalian University; Dalian 116001 China