9. Female patients of childbearing potential must agree to use dual methods of contraception and have a negative serum pregnancy test within 2 weeks prior to enrollment. Male patients must use an effective barrier method of contraception if sexually active with a female of child-bearing potential. Acceptable methods of contraception are condoms, contraceptive patch, intrauterine device, diaphragm with spermicidal gel, or a sexual partner who is surgically sterilized or post menopausal. Post menopausal is defined as at least 12 consecutive months without menses.