Published on in Vol 9, No 2 (2021): February
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/20329, first published
.
![Induction of Efficacy Expectancies in an Ambulatory Smartphone-Based Digital Placebo Mental Health Intervention: Randomized Controlled Trial Induction of Efficacy Expectancies in an Ambulatory Smartphone-Based Digital Placebo Mental Health Intervention: Randomized Controlled Trial](https://asset.jmir.pub/assets/b35d3fd4ffc26a9a079e88c18879adf8.png 480w,https://asset.jmir.pub/assets/b35d3fd4ffc26a9a079e88c18879adf8.png 960w,https://asset.jmir.pub/assets/b35d3fd4ffc26a9a079e88c18879adf8.png 1920w,https://asset.jmir.pub/assets/b35d3fd4ffc26a9a079e88c18879adf8.png 2500w)
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