Matsumura, Kazushi http://orcid.org/0000-0003-0127-5842
Ito, Shigeaki
Article History
Received: 31 May 2019
Accepted: 24 January 2020
First Online: 3 February 2020
Ethics approval and consent to participate
: All procedures in the current study were performed in accordance with approval from the local research ethics committees at Japan Tobacco Inc. Datasets of healthy non-smokers, healthy current smokers, and smokers with COPD used in the current study are all from secondary sources, where primary ethics approval had obtained for data acquisition.
: Not applicable.
: The authors are employees of Japan Tobacco Inc., and they have no competing interests with respect to the research, authorship, and/or publication of this article.