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. 2015 Mar 21;8:11. doi: 10.1186/s13040-015-0043-7

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© Li et al.; licensee BioMed Central. 2015

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Smokeless tobacco temporal trend. The X-axis is the year while the Y-axis is yearly proportion of key words of smokeless tobacco.