<qa>  What is ADDING TOCILIZUMAB TO METHOTREXATE TRA STUDY OF TOCILIZUMAB AND METHOTREXATE TREATMENT STRATEGIES ADDING TOCILIZUMAB TO METHOTREXATE VERSUS SWITCHING TO TOCILIZUMAB IN PATIENTS WITH ACTIVE RHEUMATOID ARTHRITIS WITH INADEQUATE RESPONSE TO PRIOR METHOTREXATE TREATMENT: 