Funding for this research was provided by:
Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2017R1D1A1B03029050)
a grant from the Korea Health Technology R&D Project through the Korea Health Industry Development Institute, funded by the Ministry of Health and Welfare, Republic of Korea (HI14C1324)
Text and Data Mining valid from 2018-07-31
Received: 18 April 2018
Accepted: 24 July 2018
First Online: 31 July 2018
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of Severance Hospital (4–2017-0673), who waived the need for patient written informed consent, as this was a retrospective study.
: The authors declare that they have no competing interests.
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