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Andersen K, Baardsen R, Dalen I, Larsen JP.Andersen K, et al. Among authors: dalen i.J Back Musculoskelet Rehabil. 2018 Feb 6;31(1):1-13. doi: 10.3233/BMR-170897.J Back Musculoskelet Rehabil. 2018.PMID: 29278872Free PMC article.