. 2013 May 7;2013:672702. doi: 10.1155/2013/672702
Copyright © 2013 A. L. Holm and E. Severinsson.
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 1.
Search and retrieval process.