Explanation of terms and methodology
Web of Science, CrossRef and Altmetric
Single number count for article citations from each service's database may vary by service. The
citations counts are reliant on the availability of the individual APIs from Web of Science and
CrossRef. These counts are updated daily once they become available. Once a citation
count is available, the list of articles citing this one is accessible by clicking on the circle for
that citation source.
News, blogs and Google+ posts
The number of times an article has been cited by individual mainstream news sources, blog post, or
member of Google+ along with a link to the original article or post. News articles, blog posts and
Google+ posts do not always link to articles in a way that can be picked up by aggregators used by
Altmetric, so the listed links are not necessarily a reflection of the entire scope of media, blog
or Google+ interest. Further, the list of blogs and news sources covered is manually curated by
Altmetric and thus is subject to their discretion for inclusion as a scientific blog or media
source. The news, blog, and Google+ posts are provided by Altmetric and are updated hourly.
Altmetric calculates a score based on the online attention an article receives. Each coloured
thread in the circle represents a different type of online attention and the number in the
centre is the Altmetric score. The score is calculated based on two main sources of online
attention: social media and mainstream news media. Altmetric also tracks usage in online
reference managers such as Mendeley and CiteULike, but these do not contribute to the score.
Older articles will typically score higher because they have had more time to get noticed. To
account for this, Altmetric has included the context data for articles of a "similar age"
(published within 6 weeks of either side of the publication date of this article).
For a more detailed description of Altmetric, the Altmetric score, and sources used, please see
Provides the number of tweets broken down by country of origin for the Twitter account. The
geographic breakdown for the twitter sources is provided by Altmetric and is updated hourly.