 5. Male subjects who are not abstinent or have not undergone a successful vasectomy, who are partners of women of childbearing potential, must use, or their partners must use, a highly effective method of contraception e.g., condom plus spermicide, condom plus diaphragm with spermicide, IUD 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. 