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Germack HD, Mahmoud K, Cooper M, Vincent H, Koller K, Martsolf GR.Germack HD, et al. Among authors: martsolf gr.BMC Health Serv Res. 2021 Jul 5;21(1):653. doi: 10.1186/s12913-021-06605-y.BMC Health Serv Res. 2021.PMID: 34225719Free PMC article.