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Backhaus, M., Burmester, G. R., Gerber, T., Grassi, W., Machold, K. P., Swen, W. A., … Manger, B. (2001). Guidelines for musculoskeletal ultrasound in rheumatology. Annals of the Rheumatic Diseases. https://doi.org/10.1136/ard.60.7.641