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Stei MM, Loeffler KU, Holz FG, Herwig MC.Stei MM, et al. Among authors: herwig mc.Biomed Res Int. 2016;2016:4521807. doi: 10.1155/2016/4521807. Epub 2016 Jun 6.Biomed Res Int. 2016.PMID: 27366747Free PMC article.Review.