Text and Data Mining valid from 2019-04-16
Received: 25 October 2018
Accepted: 31 March 2019
First Online: 16 April 2019
Ethics approval and consent to participate
: This study was approved by the institutional review board at Seoul National University Hospital (IRB; H-1412-022-631) and was conducted in accordance with the guidelines of the Declaration of Helsinki for biomedical research. Informed written consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interest.
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