Received: 5 December 2019
Accepted: 1 June 2020
First Online: 9 June 2020
Ethics approval and consent to participate
: The study was approved by the Seoul National University Hospital Clinical Research Institute (IRB No. 1902–064-1010). Since this study did not involve experimentation on human subjects, written informed consent was waived by our institutional review board. The patient information used in this study was anonymised before its use.
: Not applicable.
: The authors declare no conflicts of interest related to this study.