Sheng, Yangyang
Yang, Lijun
Li, Chunfu
Wang, Yuping
Guo, Hongxiang http://orcid.org/0000-0002-2667-5490
Funding for this research was provided by:
the project of young backbone teachers in Henan province (2014GGJS-039)
the science and technology project of Tobacco Company of Zhumadian city (201741170020121)
Open Science and Technology Cooperation Projects of Henan Province (142106000187)
Article History
Received: 9 April 2018
Accepted: 8 May 2019
First Online: 20 May 2019
Compliance with ethical standards
:
: The authors declare no competing or financial interests.