RT Journal Article SR Electronic T1 HL-A 27 in Crohn's disease. JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 422 OP 424 DO 10.1136/ard.33.5.422 VO 33 IS 5 A1 R K Jacoby A1 M I Jayson YR 1974 UL http://ard.bmj.com/content/33/5/422.abstract AB