CRP and ankylosing spondylitis: r-axSpA; radiographic axial spondylarthritis, bDMARDS; biological disease-modifying antirheumatic drugs, HLA-B27; Human leukocyte antigen B27, NSAID; non-steroidal anti-inflammatory drug, cDMARDS; conventional disease-modifying antirheumatic drugs, ASDAS; Ankylosing Spondylitis Disease Activity Score, CRP; C-reactive protein, ESR; Erythrocyte Sedimentation Rate, Hb: Hemoglobin, WBC; White Blood Cell Count, PLT; Platelet Count, ALT; Alanine Aminotransferase