1. Department of Cell and Developmental Biology, Max Planck Institute for Molecular Biomedicine, Münster, Germany
2. Center for Stem Cell Research, Institute of Biomedical Science and Technology, Konkuk University, Seoul, Republic of Korea
3. Department of Neuroscience, School of Medicine, Konkuk University, Seoul, Republic of Korea
4. Institute of Pathology, University Hospital, RWTH Aachen University, Aachen, Germany
5. Department of Stem Cell Biology, SMART Institute of Advanced Biomedical Science, Konkuk University, Seoul, Republic of Korea
6. Department of Clinical Andrology, Centre for Reproductive Medicine and Andrology, University of Münster, Münster, Germany
7. Department of Cell Biology, Institute for Biomedical Engineering, Medical School, RWTH Aachen University, Aachen, Germany
8. Helmholtz Institute for Biomedical Engineering, RWTH Aachen University, Aachen, Germany
9. Faculty of Medicine, University of Münster, Münster, Germany