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Engjom T, Larsen KK, Hove O, Gilja OH.Engjom T, et al.Tidsskr Nor Laegeforen. 2010 Aug 26;130(16):1627-9. doi: 10.4045/tidsskr.09.0771.Tidsskr Nor Laegeforen. 2010.PMID: 20805862Free article.Norwegian.