 3. Study procedures One day preoperative, together with regular blood drawing, blood for AMH concentration assessment is drawn. The operation procedure will either be the regular procedure or the regular procedure plus removal of the Fallopian tubes by removing the tubes from the ovaries by dissection of the mesovarium. On an expected average of six months after the operation blood for serum AMH concentration assessment is drawn. Blood serum is stored at -80C and AMH concentration assessment is performed in one badge. 