Funding for this research was provided by:
Else Kröner-Fresenius-Stiftung (2014_A193)
Deutsche Forschungsgemeinschaft (WA1706/8-1, WA1706/11-1)
Interdisziplinäres Zentrum für Klinische Forschung, Medizinische Fakultät der RWTH Aachen (O1-4, O1-3)
Received: 5 November 2018
Accepted: 17 January 2019
First Online: 4 February 2019
Ethics approval and consent to participate
: Mesenchymal stromal cells were isolated from bone marrow (caput femoris) of patients undergoing orthopedic surgery after written consent and the study was approved by the Ethic Committee of the Use of Human Subjects at the University of Aachen (permit number: EK128/09).
: Not applicable.
: WW is cofounder of Cygenia GmbH that can provide service for various epigenetic signatures (ExternalRef removed). Apart from this, the authors have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.