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. 2019 Sep 25;21(9):e14394. doi: 10.2196/14394

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©Maria Karampela, Minna Isomursu, Talya Porat, Christos Maramis, Nicola Mountford, Guido Giunti, Ioanna Chouvarda, Fedor Lehocki. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 25.09.2019.

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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Bubble graphs associating the empirical types with the research types (left) and the approaches (right) of the included connected health studies. The vertical axis (empirical type) is shared between the two graphs. The size and shade of each bubble represents the absolute frequency of connected health papers belonging to a given pair of empirical type and research type (left) or approach (right); absolute frequencies less than 5 are not typed inside the bubble because of space limitations. The horizontal and vertical axes labels are accompanied by the relative frequency (ie, percentage) of the class.