Funding for this research was provided by:
Fukuoka Foundation for Sound Health (2014)
Received: 19 September 2019
Accepted: 24 February 2020
First Online: 14 March 2020
Ethics approval and consent to participate
: This study was reviewed and approved by the Institutional Review Board of the Catholic University of Korea (SC14SISI0052) with a waiver of informed consent because the samples used in this study are legitimate according to the Bioethic Law and the data and images in this study were entirely deidentified.
: Not applicable.
: The authors declare that they have no competing interests.