. 2011 Mar 15;10:17. doi: 10.1186/1476-069X-10-17
Copyright ©2011 Spies et al; licensee BioMed Central Ltd.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 2.
Face groups of study participants.