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Bjørnerheim R, Andreassen AK, Nitter-Hauge S, Smith P, Platou ES, Smiseth OA.Bjørnerheim R, et al.Tidsskr Nor Laegeforen. 1996 Mar 20;116(8):976-80.Tidsskr Nor Laegeforen. 1996.PMID: 8650661Norwegian.