RT Journal Article SR Electronic T1 Ultrasonography in rheumatology: an evolving technique JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 268 OP 271 DO 10.1136/ard.57.5.268 VO 57 IS 5 A1 WALTER GRASSI A1 CLAUDIO CERVINI YR 1998 UL http://ard.bmj.com/content/57/5/268.abstract AB