Published on in Vol 21, No 1 (2019): January
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/11250, first published
.
1 Department of Sports Medicine, Disease Prevention and Rehabilitation, Institute of Sports Science, Johannes Gutenberg University, Mainz, Germany
2 I. Department of Medicine, University Medical Center, Johannes Gutenberg University, Mainz, Germany