Retraction Note: Stem Cell Res Ther (2018) 9:223

https://doi.org/10.1186/s13287-018-0952-8

The authors have retracted this article [1] because there is erroneous data in Figure 1C. Flow cytometry results of EPC cell markers CD31 and CD45 could not be replicated. Due to incorrect cell markers, the cells cultured may not have been pure EPCs. Therefore the scientific content of the article is no longer reliable. All authors agree to this retraction.