24. Cont'd # 23 Highly effective contraception must be used by both sexes during the study and must be continued for 3 months after the last dose of study treatment. (Women of not childbearing potential: post-menopausal [age > 55 years with cessation of menses > 12 months or < 55 years but not spontaneous menses for at least 2 years or < 55 years and spontaneous menses within the past 1 year, but currently amenorrheic (eg, spontaneous or secondary to hysterectomy), and with postmenopausal gonadotropin levels (luteinizing hormone and follicle-stimulating hormone levels > 40 IU/L) or postmenopausal estradiol levels (< 5 ng/dL) or according to the definition of "postmenopausal range" for the laboratory involved] or who have had a hysterectomy, bilateral salpingectomy, or bilateral oophorectomy).