Published on in Vol 4, No 5 (2020): May
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/16297, first published
.
![Using the Preparation Phase of the Multiphase Optimization Strategy to Develop a Messaging Component for Weight Loss: Formative and Pilot Research Using the Preparation Phase of the Multiphase Optimization Strategy to Develop a Messaging Component for Weight Loss: Formative and Pilot Research](https://asset.jmir.pub/assets/c49d87f3bb055b0659ab3d7316c6a288.png 480w,https://asset.jmir.pub/assets/c49d87f3bb055b0659ab3d7316c6a288.png 960w,https://asset.jmir.pub/assets/c49d87f3bb055b0659ab3d7316c6a288.png 1920w,https://asset.jmir.pub/assets/c49d87f3bb055b0659ab3d7316c6a288.png 2500w)
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