RT Journal Article SR Electronic T1 Why we need guidelines for clinical trials in vasculitis and systemic lupus erythematosus JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 569 OP 570 DO 10.1136/ard.2006.065854 VO 66 IS 5 A1 Chetan Mukhtyar A1 Dimitrios Boumpas A1 Caroline Gordon A1 Wolfgang Gross A1 David Jayne A1 Raashid Luqmani YR 2007 UL http://ard.bmj.com/content/66/5/569.abstract AB