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tokens: We thank the anonymous referee for helpful comments and suggestions. This work is partly supported by the National Natural Science Foundation of China (Grant No. U1431126; 11263002; 11311140248; 11203026) and Guizhou Natural Science Foundations (201519; 20134021; 20117006). HYC was supported by BK21 Plus of the National Research Foundation of Korea and a National Research Foundation of Korea Grant funded by the Korean government (NRF-2015M1A3A3A02009155).