Published on in Vol 6 , No 5 (2018) :May
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/9471, first published
.

1 National Centre for Sport and Exercise Medicine, School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, United Kingdom
2 Leicester Biomedical Research Centre, Leicester General Hospital, Leicester, United Kingdom