The aetiology of endometriosis , a common and disabling disorder , is presently unknown , although immune dysfunction could allow ectopic endometrial fragments to survive outside the uterine cavity .
the aetiology of endometriosis , a common and disabling disorder , is presently unknown , although immune dysfunction could allow ectopic endometrial fragments to survive outside the uterine cavity .
O O O B-other_name O O O O O O O O O O O O B-other_name I-other_name O O B-tissue I-tissue I-tissue O O O O B-body_part I-body_part O