Published on in Vol 5 , No 1 (2019) :Jan-Mar
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/9544, first published
.

1 Statens Serum Institut, Copenhagen, Denmark
2 Department of Computer Science, University College London, London, United Kingdom
3 Department of Computer Science, University of Copenhagen, Copenhagen, Denmark