14. Women who are pregnant, women who are not willing to stop breastfeeding during study period and for 10 days after the last dose of study drug, women of child bearing potential, or men with a sexual partner of child bearing potential who are not willing to use double-barrier method during study period and at least 3 months (for men) or at least 1 month (for women) after the last dose of study drug. Double-barrier method is defined as a combination of 2 effective contraceptive methods, such as condom or condom containing spermicide in combination with a diaphragm, oral contraceptive, or intrauterine device.