Following the publication of this article, we regret to report that we have been unable to reproduce the results presented in the paper in our subsequent studies. At the present time, we have not been able to ascertain the reason behind this. Therefore, we would like to retract this article from publication. All the named authors agree to this retraction. We regret any inconvenience to the readers that this retraction will cause. [The original article was published in Molecular Medicine Reports 14: 819-824, 2016; DOI: 10.3892/mmr.2016.5294].