7. Women of childbearing potential (including peri-menopausal women who have had a menstrual period within 1 year of enrollment) must be using appropriate birth control (defined as a method with low failure rate, i.e., less than 1% per year, when used consistently and correctly such as implants, injectables, some intrauterine contraceptive devices, sexual abstinence, or a vasectomized partner) during the entire duration of study participation. Use of contraceptive medications is allowed during the study. Women who have undergone a total hysterectomy or are postmenopausal are eligible.