PT - JOURNAL ARTICLE ED - , TI - Site of psoriasis (scalp or intergluteal/perianal), ⩾3 affected sites, and nail dystrophy predicted psoriatic arthritis in incident psoriasis AID - 10.1136/ebm.14.6.185 DP - 2009 Dec 01 TA - Evidence Based Medicine PG - 185--185 VI - 14 IP - 6 4099 - http://ebm.bmj.com/content/14/6/185.short 4100 - http://ebm.bmj.com/content/14/6/185.full SO - Evid Based Med2009 Dec 01; 14