1. Department of Pancreatic and Thyroidal Surgery, Shengjing Hospital Affiliated to China Medical University, Shenyang, Liaoning 110000, P.R. China
2. Department of Hepatobiliary and Pancreatic Surgery, The Second Hospital Affiliated to Dalian Medical University, Dalian, Liaoning 116000, P.R. China
3. Department of General Surgery, Shengjing Hospital Affiliated to China Medical University, Shenyang, Liaoning 110000, P.R. China
4. Department of Gastroenterology Surgery, Liaoning Provincial Tumor Hospital, Shenyang, Liaoning 110000, P.R. China
5. Department of Gastric Surgery, Liaoning Provincial Tumor Hospital, Shenyang, Liaoning 110000, P.R. China