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. 2015 Jul 1;9:3393–3404. doi: 10.2147/DDDT.S85633

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© 2015 Kissin. This work is published by Dove Medical Press Limited, and licensed under Creative Commons Attribution – Non Commercial (unported, v3.0) License

The full terms of the License are available at http://creativecommons.org/licenses/by-nc/3.0/. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed.

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Time courses of popularity indices related to patents and articles for TRP channels (A) and serotonin (B).

Notes: The article-related popularity index is the percentage of articles on a topic among all articles on pain published over the same 5-year period. Similarly, the patent-related popularity index is the percentage of patents on a topic among all US patents pertinent to pain. The figure indicates that changes in the patent-related popularity index on these two topics occur faster than for the article-related popularity index.

Abbreviation: TRP, transient receptor potential.