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Sagbakken M, Spilker RS, Nielsen TR.Sagbakken M, et al. Among authors: nielsen tr.BMC Health Serv Res. 2018 Nov 29;18(1):910. doi: 10.1186/s12913-018-3720-7.BMC Health Serv Res. 2018.PMID: 30497459Free PMC article.