. 2009 Feb 8;10:13. doi: 10.1186/1471-2296-10-13
Copyright © 2009 Allan 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.
Patients surveyed by year.