Funding for this research was provided by:
National Research Foundation (NRF-2018M3A9A8017949)
Text and Data Mining valid from 2019-11-21
Received: 16 September 2019
Accepted: 13 November 2019
First Online: 21 November 2019
Ethics approval and consent to participate
: All patients provided written informed consent. The study was approved by the Korea University Hospital Institutional Review Board.
: Not applicable.
: The authors declare that they have no competing interests.