4. Female subjects of childbearing potential — not surgically sterile or at least 2 years postmenopausal — must agree to utilize one of the following forms of contraception from screening through completion of the study: abstinence, hormonal (oral, implant, transdermal, or injection) for at least 3 months prior to the first dose of the study, barrier (condom with spermicide, diaphragm with spermicide), IUD, or vasectomized partner (6 months minimum).