IL6 and endometriosis: The concentrations of serum IL-6 in our endometriosis, non-endometriosis and control groups (mean values: 15.55 pg/mL, 16.23 pg/mL and 1.47 pg/mL, respectively) were similar to the concentrations published by Bedaiwy et al. [30] (median: 21.58 pg/mL for E group and 0.00 pg/mL for the control group, corresponding to our NE group), as well as to the results obtained by Kashanian et al. [33] (mean values: 30.42 pg/mL and 13.98 pg/mL, for E and the control group, comparable to our NE group, respectively).