Effect of continuous versus on-demand treatment of ankylosing spondylitis with diclofenac over 2 years on radiographic progression of the spine: results from a randomised multicentre trial (ENRADAS) - Sieper, J; Listing, J; Poddubnyy, D (Ann Rheum Dis, 2016)
doi:10.1136/annrheumdis-2015-207897