3. Female patients must have negative serum and urine pregnancy tests and be post-partum for at least one year or not breast feeding at the initial screening visit and throughout the study. For female patients able to bear children, an acceptable method of birth control must be used throughout the study. Patients unable to bear children must have documentation of such in the case report form (i.e., tubal ligation, hysterectomy, or post-menopausal [defined as a minimum of one year since the last menstrual period]).