. 2012 Jul 2;7(1):363. doi: 10.1186/1556-276X-7-363
Copyright ©2012 Yao et al.; licensee Springer.
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.
The experimental setup.