IL22 and diabetes mellitus: Correlation analysis showed that IL-22 concentrations in serum (r=0.479, p=0.009), unstimulated (r=0.672, p<0.001) and stimulated PBMCs (r=0.680, p<0.001) were positively correlated with the duration of diabetes (Table 4, Figure 4, Figure 5, and Figure 6).