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Markussen DL, Hagen JE, Tvedt A, Steihaug OM.Markussen DL, et al.Tidsskr Nor Laegeforen. 2021 Apr 13;141(7). doi: 10.4045/tidsskr.21.0114. Print 2021 May 4.Tidsskr Nor Laegeforen. 2021.PMID: 33950662Free article.Norwegian.