Published on in Vol 21 , No 7 (2019) :July
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/13041, first published
.

1 Institute of Anesthesiology, University and University Hospital Zurich, Zurich, CH
2 Institute of Anesthesiology Kantonsspital Winterthur, Winterthur, CH
*these authors contributed equally