The above article, published online on 16 August 2011 in Wiley Online Library (wileyonlinelibrary.com), has been retracted by agreement between the journal Editor-in-Chief, Prof. Christoph Plass; the Union for International Cancer Control; and John Wiley & Sons Ltd.
Following publication, concerns were raised by third parties regarding Figure 2D. Additional concerns were found during an investigation by the editorial office regarding Figures 1A and 4A. The authors were unable to provide comprehensive original data. The retraction has been agreed because parts of the figures and the underlying data were duplicated. The editors no longer have confidence in the data reported in this article or in the interpretation of the results presented.
The authors S. H. O, J.-H. K., and H.-Y. L. were informed of the decision to retract; J. K. W., O.-H. L., and E. S. K. could not be contacted.