RT Journal Article SR Electronic T1 Prologue: Group for Research and Assessment of Psoriasis and Psoriatic Arthritis (GRAPPA) JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP ii1 OP ii2 DO 10.1136/ard.2004.033894 VO 64 IS suppl 2 A1 Mease, P J A1 Gladman, D D A1 Krueger, G G YR 2005 UL http://ard.bmj.com/content/64/suppl_2/ii1.abstract AB