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Fredheim OM, Kaasa S, Fayers P, Saltnes T, Jordhøy M, Borchgrevink PC.Fredheim OM, et al.Acta Anaesthesiol Scand. 2008 Jan;52(1):143-8. doi: 10.1111/j.1399-6576.2007.01524.x. Epub 2007 Nov 13.Acta Anaesthesiol Scand. 2008.PMID: 18005378