3.1.3. Cross-Sectional Studies in Humans

Cross-sectional studies evaluated biopsies of endometrial lesions and peritoneal fluid in patients with endometriosis who underwent surgery. The disease stage was classified according to criteria established by the ASRM. Additionally, patients in the control group were confirmed with the absence of endometriosis and tissue cells from the peritoneal cavity collected when operated on due to other reasons. Then, the study was conducted based on an analysis of different types of laboratory exams [26,31,36–39].
