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Ekstrand J, Boreus LO, de Chateau P.Ekstrand J, et al. Among authors: boreus lo.Br Med J (Clin Res Ed). 1981 Sep 19;283(6294):761-2. doi: 10.1136/bmj.283.6294.761.Br Med J (Clin Res Ed). 1981.PMID: 6791740Free PMC article.No abstract available.