The affiliations for the third author were listed incorrectly. The correct affiliations for Prisca Chapouton are:
3 Helmholtz Zentrum München–German Research Center for Environmental Health, Institute of Stem Cell Research, Neuherberg, Germany
4 Biomedical Center, Department for Cell Biology and Anatomy, Medical Faculty, Ludwig-Maximilians-Universität, Planegg-Martinsried, Germany
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