12. Use of effective method of contraception by females of childbearing potential 30-days before the screening visit and agree to continue to practice that acceptable method of contraception for the duration of her participation in the study. Acceptable methods of contraception include oral, injectable, or implantable contraceptives; intrauterine devices, diaphragm plus spermicide; abstinence (must agree to use double-barrier method if they become sexually active), transdermal patch, or any double barrier method including a vasectomized sexual partner. Women who have had a hysterectomy (partial or total) or tubal ligation at least 6 months prior to Visit 1 or who have been post-menopausal for at least 1 year prior to Visit 1 are not considered to be of childbearing potential.