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. 2015 Mar 26;17(3):e22. doi: 10.2196/jmir.3875

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©Shiliang Wang, Michael J Paul, Mark Dredze. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 26.03.2015.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.

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Summary of annotation results on sample of 170 messages. Tree structure indicates which codes are dependent on their parent codes. Different branches are not mutually exclusive.