Any subject with significant physical, EKG, mammogram or laboratory abnormalities will not participate in this protocol. Additionally prior to participation all subjects will be examined for any contradictions to estrogen therapy (as determined by a pelvic exam and mammogram) within the past year by a gynecologist of their choice. In those patients who are unable to independently arrange this exam, we have arranged for a consultant gynecologist to be available through our collaboration with NICHD.