Amris, K., G. Luta, R. Christensen, B. Danneskiold-Samsøe, H. Bliddal, and E. E. Wæhrens. “Predictors of Improvement in Observed Functional Ability in Patients With Fibromyalgia As an Outcome of Rehabilitation”. Journal of Rehabilitation Medicine, vol. 48, no. 1, Nov. 2015, pp. 65-71, doi:10.2340/16501977-2036.