[Comparison of local immune microenvironment between liver-metastasis colorectal cancer and non-liver-metastasis colorectal cancer]. - Zou YF; Cai ZR; Chen YF; Rong YM; Wu XR; Yuan RX; He XS; Wu XJ; Lan P (Zhonghua wei chang wai ke za zhi = Chinese journal of gastrointestinal surgery, 2013)