Funding for this research was provided by:
the Natural Science Foundation of Anhui Province (1508085MA15)
the Key project of cultivation of leading talents in Universities of Anhui Provence (gxbjZD2016014)
the Innovation and practice research project of graduate students of Anhui Normal University (2017cxsj045)
the project of Academic and technical leaders candidate of Anhui Province (2017H117)
Article History
Received: 26 February 2018
Accepted: 13 May 2018
First Online: 5 June 2018
Compliance with ethical standards
:
: The authors have declared that no competing interests exist. These authors contributed equally to this work.