COMPARISON OF LONG TERM ANTI-TNF SURVIVAL IN PATIENTS WITH ANKYLOSING SPONDYLITIS AND NON-RADIOGRAPHIC AXIAL SPONDYLOARTHRITIS; DATA FROM TURKBIO REGISTRY - İNANÇ, GÜZİDE NEVSUN; ATAGÜNDÜZ, MEHMET PAMİR (BMJ PUBLISHING GROUP, 2018)