Text and Data Mining valid from 2014-08-24
Received: 14 May 2013
Accepted: 1 July 2014
First Online: 24 August 2014
Change Date: 10 October 2014
Change Type: Erratum
Change Details: In the version of this article initially published, author Jeffrey Rosenfeld's middle initial “A” was omitted. The error has been corrected in the HTML and PDF versions of the article.
: The authors declare no competing financial interests.