Funding for this research was provided by:
National High-tech R&D Program (2014AA015103)
Self-determined Research Funds of CCNU from the Colleges’ Basic Research and Operation of MOE, China (CCNU15A05049, CCNU16JYKX38)
Article History
Received: 23 June 2018
Revised: 11 July 2018
Accepted: 12 July 2018
First Online: 18 July 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study used data available in the public domain. Ethical approval and informed consent was not applicable.