Ding, Yaru
Chen, Yulan
Lin, Zhengquan
Tuo, Yangyang
Li, Hongli
Wang, Yan
Funding for this research was provided by:
Liangshanzhou company of Sichuan tobacco company (LSYC201803)
Article History
Received: 22 April 2020
Accepted: 7 December 2020
First Online: 4 January 2021
Compliance with Ethical Standards
:
: Author Yulan Chen was employed by Liangshan Prefecture Company, Tobacco Company of Sichuan and Zhengquan Lin was employed by Ningnan Branch, Liangshan Prefecture Company, Tobacco Company of Sichuan, and Yangyang Tuo was employed by Dechang Branch, Liangshan Prefecture Company, Tobacco Company of Sichuan. The remaining authors state that this work was conducted without any potential economic and conflict of interest.