Funding for this research was provided by:
Program for the Outstanding Young Talents of Hebei Province
Ministry of Human Resources and Social Security of China (CG2015003002)
Cultivation project of National Engineering Technology Center (2017B090903008)
Guangdong Provincial Science and Technology Project (2017A050506009)
Received: 2 July 2018
Accepted: 17 September 2018
First Online: 3 October 2018
: The authors declare that they have no competing interests.
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