1. Department of General Surgery, Xiangya Hospital Central South University, Changsha, Hunan Province, China
2. Hunan Key Laboratory of Precise Diagnosis and Treatment of Gastrointestinal Tumor, Xiangya Hospital Central South University, Changsha, Hunan Province, China
3. Department of General, Visceral and Transplant Surgery, University Hospital Tuebingen, Tuebingen, Germany
4. Department of General Surgery, Huaihua Hospital Affiliated to University of South China, Huaihua, Hunan Province, China