1. State Key Laboratory of Cancer Biology and Experimental Teaching Center of Basic Medicine, Fourth Military Medical University, Xi'an, China
2. Department of Gastroenterology, Second Affiliated Hospital of Harbin Medical University, Harbin, China
3. Department of Hepatobiliary Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
4. State Key Laboratory of Cancer Biology and Xijing Hospital of Digestive Diseases, Xijing Hospital, Fourth Military Medical University, Xi'an, China