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Skjellegrind K, Bergseng H.Skjellegrind K, et al. Among authors: bergseng h.Tidsskr Nor Laegeforen. 2019 Nov 4;139(16). doi: 10.4045/tidsskr.18.0861. Print 2019 Nov 5.Tidsskr Nor Laegeforen. 2019.PMID: 31686480Free article.Norwegian.