Luciano JV, Aguado J, Serrano-Blanco A, Calandre EP, Rodriguez-Lopez CM. Dimensionality, reliability, and validity of the revised fibromyalgia impact questionnaire in two Spanish samples. Arthritis Care Res (Hoboken). 2013 Oct;65(10):1682-9.
Mease P, Arnold L, Crofford L, Williams D, Russell IJ, Humphrey L, Abetz L, Martin SA. Identifying the clinical domains of fibromyalgia: contributions from clinician and patient delphi exercises. Arthritis Care Res (Hoboken). 2008 Jul;59(7):952-60.