. 2019 Apr 1;11(4):e367–e372. doi: 10.4317/jced.55617
Copyright: © 2019 Medicina Oral S.L.
This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 2.
The four groups comparison.