a. Postmenopausal: Age > 55 years with no menses for 12 or more months without an alternative medical cause. Postmenopausal: Age <= 55 years with no menses for 12 or more months without an alternative medical cause AND a follicle stimulating hormone (FSH) level >= 40 IU/L (OR) b. Permanently surgical sterile (bilateral oophorectomy, bilateral salpingectomy or hysterectomy).