Text and Data Mining valid from 2019-06-26
Received: 17 March 2019
Accepted: 17 June 2019
First Online: 26 June 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Boards of Seoul National University Hospital, and the need for informed consent was waived (IRB number; H-1509-119-705).
: Not applicable.
: Each author certifies that he or she has no commercial associations (e.g., consultancies, stock, ownership, equity interest, patent/licensing arrangements, etc.) that might pose a conflict of interest in connection with the submitted article.