<qa>  What is the most effective method of contraception?8. 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 affective method of contraception e.g. condom spermicide, condom 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. Those with partners using hormonal contraceptives must also be using an additional approved method of contraception as described previously 