We thank the Deutsche Forschungsgemeinschaft (German Research Fondation, DFG), the Bundesministerium für Bildung und Forschung (Federal Ministry of Education and Research, BMBF), the European Region Development Fund (EFRE), the BIH Charité Clinician Scientist program, the Fiebig-Stiftung, the Einstein Center for Regenerative Therapies (ECRT), Stiftung Charité and the Einstein Foundation for their financial support.

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