Received: 11 June 2019
Accepted: 2 October 2019
First Online: 22 October 2019
Ethics approval and consent to participate
: Written informed consent was obtained from all participants and the study was approved by the Institutional Review Board (IRB) of Korea University Hospital (IRB no. 2018AN0152).
: We received consent to use patients’ data through a form approved by the IRB.
: The authors declare that they have no competing interests.