. 2018 Jan 10;12:796. doi: 10.3332/ecancer.2018.796
© the authors; licensee ecancermedicalscience.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 1. PRISMA diagram.
