Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (Metarthros 01EC1407A, ArthroMark (project 4, 01EC1401C), ArthroMark (project 4, 01EC1401C))
Interdisciplinary center for clinical research Erlangen (laboratory rotation)
Received: 21 November 2019
Accepted: 28 April 2020
First Online: 12 May 2020
Ethics approval and consent to participate
: Study approval was obtained through the ethical committees of the Universities of Erlangen (209_17B and 463_18B), Frankfurt (199/15), Homburg (275/16) and Göttingen (19/7/13); all individuals provided their written informed consent and in the case of minors, written informed consent was obtained from their legal guardians. All investigations were conducted according to the Declaration of Helsinki principles.
: Not applicable.
: All authors declare that there are no competing interests.