Received: 20 February 2020
Accepted: 1 June 2020
First Online: 8 June 2020
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board (IRB, the local ethical committee) of the Ulsan University Hospital (IRB No. 2019–10-014) and the Kosin University Gospel Hospital (IRB No. 2019–10-001).
: Not applicable. The requirement for informed consent from patients was waived by the IRB because patient records and information were de-identified.
: The authors declare no competing interests.