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van den Bussche H, Kaduszkiewicz H, Schäfer I, Koller D, Hansen H, Scherer M, Schön G.van den Bussche H, et al. Among authors: koller d.BMC Health Serv Res. 2016 Apr 14;16:129. doi: 10.1186/s12913-016-1357-y.BMC Health Serv Res. 2016.PMID: 27074709Free PMC article.