- For females of reproductive potential (women who have not been post-menopausal for at least 24 consecutive months, i.e. who have had menses within 24 months prior to study entry), or women who have not undergone surgical sterilization (specifically hysterectomy or bilateral oophorectomy or tubal ligation), will require a negative serum or urine pregnancy test (latter with a sensitivity of 15-25 mIU/mL) within 2 days prior to entry.