Validity of diagnostic codes and prevalence of psoriasis and psoriatic arthritis in a managed care population, 1996-2009. (Pubmed Abstract) Authors Asgari MM, Wu JJ, Gelfand JM, Salman C, Curtis JR, Harrold LR, Herrinton LJ Abbreviation Pharmacoepidemiol Drug Saf Volume 22 Issue 8 Publication Date 2013-05-02