Published on in Vol 9, No 1 (2021): January
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/23402, first published
.
![Usability and Preliminary Effectiveness of a Preoperative mHealth App for People Undergoing Major Surgery: Pilot Randomized Controlled Trial Usability and Preliminary Effectiveness of a Preoperative mHealth App for People Undergoing Major Surgery: Pilot Randomized Controlled Trial](https://asset.jmir.pub/assets/4ff06e049aba5615579bad4fa1966a36.png 480w,https://asset.jmir.pub/assets/4ff06e049aba5615579bad4fa1966a36.png 960w,https://asset.jmir.pub/assets/4ff06e049aba5615579bad4fa1966a36.png 1920w,https://asset.jmir.pub/assets/4ff06e049aba5615579bad4fa1966a36.png 2500w)
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