RT Journal Article SR Electronic T1 Classifying childhood arthritis JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 79 OP 81 DO 10.1136/ard.56.2.79 VO 56 IS 2 A1 T R SOUTHWOOD YR 1997 UL http://ard.bmj.com/content/56/2/79.abstract AB