. 2016 May 25;12(2):725–729. doi: 10.3892/etm.2016.3389
Copyright: © Hu et al.
This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.