7. Women with childbearing potential must have a negative urine pregnancy test at Screening and be willing and able to use a medically acceptable method of birth control or they must be postmenopausal. Acceptable methods of birth control in this study include: Vasectomy, tubal ligation, consistent use of an approved oral contraceptive (birth control pill), intrauterine device (IUD), hormonal implants, contraceptive injection or a double barrier method (diaphragm with spermicidal gel or condom with contraceptive foam). Postmenopausal women are defined as women with menstruation cessation for 12 consecutive months prior to signing of the informed consent form.