1. Department of Tumor, Anus and Intestine, Jinhua People's Hospital, Jinhua, Zhejiang 321000, P.R. China
2. Department of Colorectal Surgery, Changhai Hospital, Second Military Medical University, Shanghai 200433, P.R. China
3. Department of Oncology, Lanxi People's Hospital, Lanxi, Zhejiang 321100, P.R. China