Funding for this research was provided by:
Asan Institute for Life Sciences, Asan Medical Center (2016-644)
Ministry of Education, Science and Technology (NRF-2016R1D1A1B03935929, NRF-2015K1A4A3046807)
Received: 29 August 2018
Revised: 9 December 2018
Accepted: 4 February 2019
First Online: 22 February 2019
Ethics approval and consent to participate
: A human umbilical cord was obtained following the birth of a baby at full-term and samples were obtained with written informed consent of all donors and with the approval of the Institutional Review Board of Seoul Asan Medical Center (no: 2015-0303).
: Not applicable.
: The authors declare that they have no competing interests.
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