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Bock JO, König HH, Brenner H, Haefeli WE, Quinzler R, Matschinger H, Saum KU, Schöttker B, Heider D.Bock JO, et al. Among authors: schottker b.BMC Health Serv Res. 2016 Apr 14;16:128. doi: 10.1186/s12913-016-1360-3.BMC Health Serv Res. 2016.PMID: 27074800Free PMC article.