AFTER DISCONTINUATION OF THE 1ST TUMOR NECROSIS FACTOR INHIBITOR (TNFI), NON-TNFI BIOLOGIC AGENTS HAVE SIMILAR RESPONSES BUT HIGHER SURVIVAL COMPARED TO A 2ND COURSE OF A DIFFERENT TNFI: LONG-TERM PROSPECTIVE OBSERVATIONAL STUDY OF PATIENTS WITH RHEUMATOID ARTHRITIS IN A TERTIARY HOSPITAL OF GREECE