IL6 and tuberculosis: The accuracy of MIF level for predicting drug-resistant TB was higher than that of CRP level [AUC = 0.60, 95% CI: 0.53–0.69, P = 0.015], WBC [AUC = 0.55, 95% CI: 0.47–0.63, P < 0.001] and IL-6 [AUC = 0.64, 95% CI: 0.55–0.73, P = 0.37].