RT Journal Article SR Electronic T1 Performance of referral recommendations in patients with chronic back pain and suspected axial spondyloarthritis JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 1479 OP 1484 DO 10.1136/ard.2006.068734 VO 66 IS 11 A1 Brandt, Henning Christian A1 Spiller, Inge A1 Song, In-Ho A1 Vahldiek, Janis L A1 Rudwaleit, Martin A1 Sieper, Joachim YR 2007 UL http://ard.bmj.com/content/66/11/1479.abstract AB