Extent and characteristics of self-reported pain in patients with systemic lupus erythematosus.
Waldheim E, Elkan AC, Bergman S, Frostegård J, van Vollenhoven R, Henriksson EW.
Lupus. 2013;22(2):136-43. doi: 10.1177/0961203312468625. Epub 2012 Nov 28.