<qa>  What is the name of the method of contraception that women must use?7. Females of childbearing potential must have a negative urine or serum beta hCG at Visit 1 Screening and prior to starting study drugs on Day 1. Female subjects of childbearing potential must agree to be abstinent or to use highly effective methods of contraception e.g., condom spermicide, condom diaphragm with spermicide, intrauterine device IUD, or have a vasectomized partner having starting for at least one menstrual cycle prior to starting study drugs and throughout the entire study period and for 30 days longer if appropriate after the last dose of study drug. Those women using hormonal contraceptives must also be using an additional approved method of contraception as described previously. Perimenopausal women must be amenorrheic for at least 12 months to be considered of nonchildbearing potential. 