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Tran AT, Straand J, Dalen I, Birkeland KI, Claudi T, Cooper JG, Meyer HE, Jenum AK.Tran AT, et al. Among authors: birkeland ki.BMC Health Serv Res. 2013 May 20;13:182. doi: 10.1186/1472-6963-13-182.BMC Health Serv Res. 2013.PMID: 23688317Free PMC article.