Received: 19 November 2019
Accepted: 15 April 2020
First Online: 23 April 2020
Ethics approval and consent to participate
: All participants were informed about the study and written consent was obtained prior to the enrollment. Ethical approval of this study was approved by the institutional review board of Seoul National University Hospital (IRB Number: 1804–064-936).
: Not Applicable.
: The authors declare that they have no competing interests.