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. 2020 Nov 3;22(11):e17247. doi: 10.2196/17247

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©Florent Schäfer, Carole Faviez, Paméla Voillot, Pierre Foulquié, Matthieu Najm, Jean-François Jeanne, Guy Fagherazzi, Stéphane Schück, Boris Le Nevé. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 03.11.2020.

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 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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Heatmap presenting the results of the hierarchical clustering of web users on the basis of the discussed topics, symptoms, and activity on websites. GERD: gastroesophageal reflux disease.