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Biringer E, Hartveit M, Hove O, Kvalevaag AL.Biringer E, et al. Among authors: kvalevaag al.Tidsskr Nor Laegeforen. 2010 Jun 3;130(11):1124-5. doi: 10.4045/tidsskr.09.0838.Tidsskr Nor Laegeforen. 2010.PMID: 20531494Free article.Norwegian.No abstract available.