Funding for this research was provided by:
Research fund of Chungnam National University and the Brain Korea 21 PLUS Project for Medical Science, Chungnam National University
Text and Data Mining valid from 2020-01-29
Received: 11 October 2019
Accepted: 17 January 2020
First Online: 29 January 2020
Ethics approval and consent to participate
: The institutional review boards of both institutions (Chungnam National University Hospital and Samsung Medical Center) approved this study (IRB No. CNUH 2015–10–032-002; SMC 2015–09–063-001) and waived the need for informed consent.
: Not applicable.
: The authors declare that they have no competing interests.