Published on in Vol 7, No 4 (2018): April
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/9537, first published
.
![The Unanticipated Challenges Associated With Implementing an Observational Study Protocol in a Large-Scale Physical Activity and Global Positioning System Data Collection The Unanticipated Challenges Associated With Implementing an Observational Study Protocol in a Large-Scale Physical Activity and Global Positioning System Data Collection](https://asset.jmir.pub/assets/c8a0c66e8018b8c3237b9fe8b1f0a216.png 480w,https://asset.jmir.pub/assets/c8a0c66e8018b8c3237b9fe8b1f0a216.png 960w,https://asset.jmir.pub/assets/c8a0c66e8018b8c3237b9fe8b1f0a216.png 1920w,https://asset.jmir.pub/assets/c8a0c66e8018b8c3237b9fe8b1f0a216.png 2500w)
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