SIRT6 and endometriosis: The serum concentrations of SIRT3, SIRT5 and SIRT6 were similar in the endometriosis (median values: 8.53 ng/mL, 5.96 ng/mL and 2.94 ng/mL, respectively), non-endometriosis (median values: 7.85 ng/mL, 7.30 ng/mL and 7.38 ng/mL, respectively) and control group (median values: 10.28 ng/mL, 6.80 ng/mL and 2.20 ng/mL, respectively).