This research was supported by National Natural Science Foundation of China, China (No. 81173198 , 81373554 , 81703963 ), Scientifc Foundation of Hunan China ( 09JJ5055 ), and International Cooperation Program of the S & T Ministry, China ( 2010DFA32370 ). The authors are grateful to Mr. Jun-Liang Deng (Biotree Biotech Co., Ltd., Shanghai, China) for providing helps in data analysis.