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
: We confirm that we have given due consideration to the protection of intellectual property associated with this work. We confirm that we have followed the regulations of our institutions concerning intellectual property. And all authors agree with its submission to Cybersecurity.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.