After publication of this article [1] in the journal Stem Cell Research and Therapy, it was brought to our attention that the acknowledgement section was not complete. The correct acknowledgement section should read:

This research was supported by the Bio & Medical Technology Development Program of the National Research Foundation (NRF) funded by the Korean government (MEST) (No. 2012M3A9C6049783) and by a grant of the Korean Health Technology R&D Project, Ministry for Health & Welfare, Republic of Korea.(HI14C3417). The authors declare that they have no competing interests.