1. Department of Hepatobiliary Surgery and Fujian Institute of Hepatobiliary Surgery, Union Hospital, Fujian Medical University, Fuzhou, Fujian 350001, P.R. China
2. Key Laboratory of Ministry of Education for Gastrointestinal Cancer and Key Laboratory of Tumor Microbiology, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, Fujian 350001, P.R. China