Correction to: Experimental & Molecular Medicine (2013) 45, e34; doi:10.1038/emm.2013.63; published online 2 August 2013

Due to an author error the National Research Foundation of Korea Grant Number was incorrectly listed in the original online publication of this article. The corrected acknowledgment is as follows.

This study was funded by the Korea Centers for Disease Control & Prevention, Ministry of Health & Welfare (2011-E53001-00) and the National Research Foundation of Korea (2010-0024004).