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Søvik TT, Aasheim ET, Taha O, Engström M, Fagerland MW, Björkman S, Kristinsson J, Birkeland KI, Mala T, Olbers T.Søvik TT, et al. Among authors: fagerland mw.Ann Intern Med. 2011 Sep 6;155(5):281-91. doi: 10.7326/0003-4819-155-5-201109060-00005.Ann Intern Med. 2011.PMID: 21893621Free article.Clinical Trial.
Fagerland MW.Fagerland MW.BMC Med Res Methodol. 2012 Jun 14;12:78. doi: 10.1186/1471-2288-12-78.BMC Med Res Methodol. 2012.PMID: 22697476Free PMC article.