College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, P. R. China
Medical College, Qingdao University, Qingdao, P.R. China

Copyright © 2012 Zhen-Hua Mei, Shu-Yu Mei et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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