<qa>  What is the first form of contraception that must be used from the last visit?3. Female subjects of childbearing potential must agree to use one of the following forms of contraception from screening through the last study visit: hormonal oral, implant, or injection begun 30 days prior to screening; barrier condom, diaphragm, or cervical cap with spermicide; intrauterine device IUD. Acceptable contraceptive options may also include abstinence, relationship with a same sex partner or partner who has had a vasectomy at least six 6 months prior to the screening visit 