CCL2 and myalgic encephalomeyelitis/chronic fatigue syndrome: In addition, CFS among patients in the T2D + DED group was positively correlated with IL-8 (rs = 0.3, p = 0.04), IL-6 (rs = 0.3, p = 0.02) and MCP-1 concentrations in tears (rs = 0.3, p = 0.03; Table S2).