Jarrett SJ, Sivera F, Cawkwell LS, Marzo-Ortega H, McGonagle D, Hensor E, Coates L, O'Connor PJ, Fraser A, Conaghan PG, Emery P. MRI and clinical findings in patients with ankylosing spondylitis eligible for anti-tumour necrosis factor therapy after a short course of etoricoxib. Ann Rheum Dis. 2009 Sep;68(9):1466–9. doi: 10.1136/ard.2008.092213. PMID: 18952641.