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. 2018 Dec 6;4(4):e10834. doi: 10.2196/10834

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©Christopher Tufts, Daniel Polsky, Kevin G Volpp, Peter W Groeneveld, Lyle Ungar, Raina M Merchant, Arthur P Pelullo. Originally published in JMIR Public Health and Surveillance (http://publichealth.jmir.org), 06.12.2018.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Public Health and Surveillance, is properly cited. The complete bibliographic information, a link to the original publication on http://publichealth.jmir.org, as well as this copyright and license information must be included.

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Theme distribution. P(t|d): probability of theme given disease; COPD: chronic obstructive pulmonary disease; PMI: pointwise mutual information.