Published on in Vol 17, No 4 (2015): April
![Validity of Internet-Based Longitudinal Study Data: The Elephant in the Virtual Room Validity of Internet-Based Longitudinal Study Data: The Elephant in the Virtual Room](https://asset.jmir.pub/assets/d8db0b1843ccfb0b541682cda505dbb7.png 480w,https://asset.jmir.pub/assets/d8db0b1843ccfb0b541682cda505dbb7.png 960w,https://asset.jmir.pub/assets/d8db0b1843ccfb0b541682cda505dbb7.png 1920w,https://asset.jmir.pub/assets/d8db0b1843ccfb0b541682cda505dbb7.png 2500w)
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Published on in Vol 17, No 4 (2015): April