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Bernhardt D, Hommertgen A, Schmitt D, El Shafie R, Paul A, König L, Mair-Walther J, Krisam J, Klose C, Welzel T, Hörner-Rieber J, Kappes J, Thomas M, Heußel CP, Steins M, Kieser M, Debus J, Rieken S.Bernhardt D, et al.Trials. 2018 Jul 16;19(1):388. doi: 10.1186/s13063-018-2745-x.Trials. 2018.PMID: 30012190Free PMC article.