Acknowledgment

We thank members of the Ni lab for their critical comments on the manuscript. This work was supported by the National Key Technology Research and Development Program of the Ministry of Science and Technology of the People’s Republic of China (2015BAI09B03, 2016YFE0113700), the National Natural Science Foundation of China (31371496, 31571320), the National Basic Research Program (2013CB35102).

Interest statement

The author(s) declare that they have no conflict of interest.

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