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APA Citation
Wæhrens, E., Amris, K., Bartels, E., Christensen, R., Danneskiold-Samsøe, B., Bliddal, H., & Gudbergsen, H. (2015). agreement between touch-screen and paper-based patient-reported outcomes for patients with fibromyalgia: a randomized cross-over reproducibility study. Scandinavian journal of rheumatology, 44, 503–510. http://access.bl.uk/ark:/81055/vdc_100089568873.0x00004d