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Natland ST, Andersen LF, Nilsen TI, Forsmo S, Jacobsen GW.Natland ST, et al. Among authors: forsmo s.BMC Med Res Methodol. 2012 Nov 23;12:179. doi: 10.1186/1471-2288-12-179.BMC Med Res Methodol. 2012.PMID: 23176436Free PMC article.