. 2013 Oct 8;6:290. doi: 10.1186/1756-3305-6-290
Copyright © 2013 Makhawi 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.
China map shows study sites.