Funding for this research was provided by:
a grant of the Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI) funded by the Ministry of Health & Welfare, Republic of Korea (HI13C2096)
Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (2017R1A2B2005772)
Text and Data Mining valid from 2019-10-21
Received: 5 February 2019
Accepted: 14 August 2019
First Online: 21 October 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of Severance Hospital (No. 4–2014-0638).
: Not applicable.
: The authors declare that they have no competing interests.