- NOTE: Pre-menopausal females with a documented tubal ligation or hysterectomy are eligible. Postmenopausal females are eligible, defined as 12 months of spontaneous amenorrhea (in questionable cases a blood sample with simultaneous follicle stimulating hormone (FSH) > 40 MlU/ml and estradiol < 40 pg/ml (<140 pmol/L) is confirmatory].