Funding for this research was provided by:
the Key Science and Technology Program of Henan Province (152107000097)
the Distinguished Talents Foundation of Henan Province (174200510001)
Article History
Received: 25 July 2017
Revised: 24 January 2018
Accepted: 5 February 2018
First Online: 10 February 2018
Compliance with ethical standards
:
: No conflict interests exist in this research.