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Eichler M, Blettner M, Singer S.Eichler M, et al. Among authors: singer s.Dtsch Arztebl Int. 2016 Dec 16;113(50):847-854. doi: 10.3238/arztebl.2016.0847.Dtsch Arztebl Int. 2016.PMID: 28098063Free PMC article.