Funding for this research was provided by:
National Natural Science Foundation of China (61728209, U1536106)
National Key R&D Program of China (2016QY04W0805)
National Top-notch Youth Talents Program of China
Youth Innovation Promotion Association CAS and Beijing Nova Program
Text and Data Mining valid from 2018-08-31
Received: 13 April 2018
Accepted: 27 July 2018
First Online: 31 August 2018
Ethics approval and consent to participate
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: The authors declare that they have no competing interests.