Funding for this research was provided by:
Natural Science Foundation of Jilin Province (61703051)
Article History
Received: 10 January 2019
Accepted: 12 April 2019
First Online: 26 April 2019
Compliance with ethical standards
:
: This work was partially supported by the National Natural Science Foundation of China (61703051), the Science and Technology Innovation Funds of Dalian (under Grant No. 2018J11CY022), Guangdong Natural Science Funds for Distinguished Young Scholar (2017A- 030306014), Department of Education of Guangdong Province (2017KZDXM027), Department of Education of Liaoning Province (LZ2017001), PhD Start-up Fund of Liaoning Province (20170520124), and Innovative Research Team Program of Guangdong Province Science Foundation (2018B030312006).
: The authors declare that they have no conflict of interest.