Published on in Vol 8, No 6 (2020): June
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/16203, first published
.
![The Use of a Smartphone App and an Activity Tracker to Promote Physical Activity in the Management of Chronic Obstructive Pulmonary Disease: Randomized Controlled Feasibility Study The Use of a Smartphone App and an Activity Tracker to Promote Physical Activity in the Management of Chronic Obstructive Pulmonary Disease: Randomized Controlled Feasibility Study](https://asset.jmir.pub/assets/0877f65ebcbcbc5fd624415303dd61b1.png 480w,https://asset.jmir.pub/assets/0877f65ebcbcbc5fd624415303dd61b1.png 960w,https://asset.jmir.pub/assets/0877f65ebcbcbc5fd624415303dd61b1.png 1920w,https://asset.jmir.pub/assets/0877f65ebcbcbc5fd624415303dd61b1.png 2500w)
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