21. No adequate contraception during the study and until 1 month after study completion, i.e. not any of the following: implants, injectables, combined oral contraceptives, IUD (intrauterine device), sexual abstinence for at least 1 month prior to enrolment, vasectomised partner (vasectomy performed at least 1 year prior to enrolment), or surgical sterilisation (including hysterectomy). Females, who do not have a vasectomised partner, are not sexually abstinent, surgically sterile, or post menopausal will be asked to use an additional barrier method (e.g. condom, diaphragm with spermicide). Post-menopausal is defined as at least 1 year of spontaneous amenorrhea and deemed post menopausal by a physician based on screening clinical laboratory tests (follicle stimulating hormone and luteinizing hormone).