The Publisher regrets that this article is an accidental duplication of an article that has already been published in Stem Cell Res., 16 (2016) 133–136, http://dx.doi.org/10.1016/j.scr.2015.12.021. The duplicate article has therefore been withdrawn. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy.
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