. 2017 Jun 22;2017:8947067. doi: 10.1155/2017/8947067
Copyright © 2017 Angela Matysiak and Amira Roess.
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 2.
Literature selection and review process.