Concepts important to patients with psoriatic arthritis are not adequately covered...

Stamm TA, Nell V, Mathis M, Coenen M, Aletaha D, Cieza A, Stucki G, Taylor W, Smolen JS, Machold KP.
Concepts important to patients with psoriatic arthritis are not adequately covered by standard measures of functioning.
Arthritis Rheum. 2007 Apr 15;57(3):487-494.