RT Journal Article SR Electronic T1 Crystal unclear JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 83 OP 85 DO 10.1136/ard.59.2.83 VO 59 IS 2 A1 P K K Wong A1 J R York A1 D Ryan A1 D Sullivan A1 N W McGill YR 2000 UL http://ard.bmj.com/content/59/2/83.abstract AB