. 2006 Nov 2;6:144. doi: 10.1186/1472-6963-6-144
Copyright © 2006 Faber 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 1.
Participants.