Funding for this research was provided by:
National Research Foundation of Korea (NRF-2017R1D1A1B03031642)
Text and Data Mining valid from 2018-10-23
Received: 22 July 2018
Accepted: 15 October 2018
First Online: 23 October 2018
Ethics approval and consent to participate
: This study was conducted in accordance with the principles of the Declaration of Helsinki. This study was approved by the Institutional Review Board of Seoul National University Bundang Hospital (no. B-1603/340–117). Under this approval, informed consent was waived.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.