We are grateful to two anonymous reviewers for their constructive comments, which have helped to substantially improve the paper. This study was supported by the startup funds provided by University at Albany, State University of New York and by National Science Foundation (NSF AGS-1247137). H. Chen was supported by the National Basic Research Program of China (Grant 2011CB952000). Y. Dai was supported by the National Natural Science Foundation of China under Grant 40875062 and the 111 Project of Ministry of Education and State Administration for Foreign Experts Affairs of China.
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