PT - JOURNAL ARTICLE AU - P J Mease AU - D D Gladman AU - G G Krueger TI - Prologue: Group for Research and Assessment of Psoriasis and Psoriatic Arthritis (GRAPPA) AID - 10.1136/ard.2004.033894 DP - 2005 Mar 01 TA - Annals of the Rheumatic Diseases PG - ii1--ii2 VI - 64 IP - suppl 2 4099 - http://ard.bmj.com/content/64/suppl_2/ii1.short 4100 - http://ard.bmj.com/content/64/suppl_2/ii1.full SO - Ann Rheum Dis2005 Mar 01; 64