. 2019 Jul 26;21(7):e14685. doi: 10.2196/14685
©Dong Jing, Yu Jin, Jianwei Liu. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 26.07.2019.
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.
Figure 3.
Model-free comparison of free services volume for physicians by (a) price setting and (b) rating.