Published on in Vol 22, No 8 (2020): August
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/19028, first published
.
![Experiences of a National Web-Based Heart Age Calculator for Cardiovascular Disease Prevention: User Characteristics, Heart Age Results, and Behavior Change Survey Experiences of a National Web-Based Heart Age Calculator for Cardiovascular Disease Prevention: User Characteristics, Heart Age Results, and Behavior Change Survey](https://asset.jmir.pub/assets/5771d4ed7463aa7dae3fa954652d03c0.png 480w,https://asset.jmir.pub/assets/5771d4ed7463aa7dae3fa954652d03c0.png 960w,https://asset.jmir.pub/assets/5771d4ed7463aa7dae3fa954652d03c0.png 1920w,https://asset.jmir.pub/assets/5771d4ed7463aa7dae3fa954652d03c0.png 2500w)
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