CD8A and endometriosis: Include:  Differences in measurable parameters (e. g. concentration, activation status, cytokine production) related to CD8+ T cells in patients and animal models with endometriosis when compared to healthy controls. Association between CD8+ T cells and disease stage, treatment response, recurrence rate after surgery, pregnancy rate, live birth rate, miscarriage rate.Exclude: Studies with no CD8+ T cell outcomes.