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This article was revised on August 15 , 2012
This article was revised on June 16 , 2012
Editor's note: the headline on this article was revised at 9.15am ET on 19 June.
This article was revised and synthesized from several pieces originally published on Amie Gordon's Psychology Today blog.
This article was revised on 8 August to clarify the lineage of the previously unidentified ruler, between the words Kan and K'an, and the timeline of the snake dynasty's reign between two cities.
Updated 10/15/18: This article was revised to more accurately describe how revenue earned by UC Berkeley from a patent for Jim Allison's Ipiluminab drug was spent by the campus.
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Update 24 January 2013: Some of the figures in this article were revised in the light of new information which was provided by NHS Grampian following publication.
The drafts of this article were revised critically by all authors.
The text of the articles was revised and updated for the book, where it was presented in 26 chapters.
In 2004 Scholastic stated that 2,500 online Americana articles were revised annually.
After peer review the articles were revised by the authors and updated if necessary.
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