Published on in Vol 21, No 6 (2019): June
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/13253, first published
.
![Understanding Long-Term Trajectories in Web-Based Happiness Interventions: Secondary Analysis From Two Web-Based Randomized Trials Understanding Long-Term Trajectories in Web-Based Happiness Interventions: Secondary Analysis From Two Web-Based Randomized Trials](https://asset.jmir.pub/assets/0afd4d76ec2ad60118cdf6e9cfab8e92.png 480w,https://asset.jmir.pub/assets/0afd4d76ec2ad60118cdf6e9cfab8e92.png 960w,https://asset.jmir.pub/assets/0afd4d76ec2ad60118cdf6e9cfab8e92.png 1920w,https://asset.jmir.pub/assets/0afd4d76ec2ad60118cdf6e9cfab8e92.png 2500w)
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