1. Department of Hepatobiliary Surgery, The First Affiliated Hospital of Shandong First Medical University, Jinan, China.
2. Department of Hepatobiliary Surgery, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, China.
3. Department of Gastrointestinal Surgery, Yantai Affiliated Hospital of Binzhou Medical University, Yantai, China.
4. Department of General Surgery, Qilu Hospital (Qingdao), Cheeloo College of Medicine, Shandong University, Qingdao, China.