Published on in Vol 9 , No 11 (2020) :November
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/18291, first published
.

1 Department of Rheumatology and Nephrology, University Medical Center Mainz, Mainz, DE
2 Department of Sports Medicine, Disease Prevention and Rehabilitation, Johannes Gutenberg University Mainz, Mainz, DE
*these authors contributed equally