Additional file 3 of CCL2-CCR2 axis recruits tumor associated macrophages to induce immune evasion through PD-1 signaling in esophageal carcinogenesis YangHui ZhangQiannan XuMiao WangLei ChenXuewei FengYongquan LiYongning ZhangXin CuiWenming JiaXudong 2020 Additional file 3. Supplementary methods.