1. Guizhou Medical University, Guiyang, Guizhou, China
2. Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
3. Department of Gastroenterology, Affiliated Hospital of Guizhou Medical University, Guiyang, Guizhou, China
4. Comprehensive Liver Cancer Center, The Fifth Medical Center of PLA General Hospital, Beijing 100039, China
5. Department of Colorectal Surgery, Affiliated Hospital of Guizhou Medical University, Guiyang 550004 Guizhou, China