Published on in Vol 6, No 5 (2018): May
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/8236, first published
.
1 Sintef, Trondheim, Norway
2 Youse GmbH, München, Germany
3 SINTEF, Oslo, Norway
4 imaginary srl, Milano, Italy