Gao, Lin
Liu, Xin-min
Du, Yong-mei
Zong, Hao
Shen, Guo-ming
Funding for this research was provided by:
China National Tobacco Corporation (110201202014)
Article History
Received: 4 July 2019
Accepted: 13 November 2019
First Online: 2 December 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: Informed consent is not applicable in this study.