Funding for this research was provided by:
National Key R&D Program of China (2016YFE0131300)
Inter-Action Inter-Excellence program of Ministry of Education, Youth and Sport of the Czech Republic (LTACH-17006)
Received: 5 May 2019
Accepted: 4 September 2019
First Online: 16 September 2019
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: All the authors agree to publication.
: The authors declare that they have no competing interests.