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Heger U, Voss S, Knebel P, Doerr-Harim C, Neudecker J, Schuhmacher C, Faist E, Diener MK, Kieser M, Seiler CM, Büchler MW.Heger U, et al. Among authors: knebel p.Trials. 2011 Nov 21;12:245. doi: 10.1186/1745-6215-12-245.Trials. 2011.PMID: 22103965Free PMC article.Clinical Trial.