Text and Data Mining valid from 2020-01-08
First Online: 8 January 2020
Compliance with ethical guidelines
: S. S. Jeske, M. N. Theodoraki, E. Boelke, S. Laban, C. Brunner, N. Rotter, E. K. Jackson, T. K. Hoffmann, and P. J. Schuler declare that they have no competing interests.
: All procedures performed in studies involving human participants or on human tissue were in accordance with the ethical standards of the institutional and/or national research committee and with the 1975 Helsinki declaration and its later amendments or comparable ethical standards. Cartilage harvesting was approved by the local ethics committee (#152/08). Informed consent was obtained from all individual participants included in the study.