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Cherbuin M, Zelder F, Karlen W.Cherbuin M, et al. Among authors: karlen w.Analyst. 2018 Dec 17;144(1):130-136. doi: 10.1039/c8an01059e.Analyst. 2018.PMID: 30460362
Hartinger SM, Nuño N, Hattendorf J, Verastegui H, Karlen W, Ortiz M, Mäusezahl D.Hartinger SM, et al. Among authors: karlen w.BMC Med Res Methodol. 2020 Apr 2;20(1):73. doi: 10.1186/s12874-020-00950-y.BMC Med Res Methodol. 2020.PMID: 32241260Free PMC article.Clinical Trial.