This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). This article has been retracted at the request of the Editor-in-Chief, as well as the authors. The article was published with pathology slides submitted by the authors. After publication, the authors notified the journal that the wrong pathology slides were submitted to the article in error. In the process, the correct slides were no longer available and therefore the authors and the Editor required a retraction of the article.