Text and Data Mining valid from 2020-04-23
Received: 22 August 2019
Accepted: 16 April 2020
First Online: 23 April 2020
Ethics approval and consent to participate
: All procedures were approved by institutional review board of Seoul National University Hospital (H-1805-054-944). All research was performed in accordance with the relevant guidelines and regulations. Informed consent was waived by the review board due to very low risk to the subject.
: Not applicable.
: The authors declare that they have no competing interests.