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J Korean Soc Res Nicotine Tob 2019; 10(1): 31-33
Published online June 15, 2019
© 2019 The Korean Society for Research on Nicotine and Tobacco.

Sang Keun Hahm and editors
This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (https://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, dis-tribution, and reproduction in any medium, provided the original work is properly cited.