Received: 14 January 2020
Accepted: 14 September 2020
First Online: 22 September 2020
Ethics approval and consent to participate
: The data collection protocol was approved by the Ajou University Hospital Institutional Review Board (MED-MDB-20-372) and implemented in accordance with the ethical standards of the 1964 Declaration of Helsinki and its later amendments. The need for written informed consent was waived given the retrospective nature of the study.
: Not applicable.
: All authors have nothing to disclose.