Article History
Received: 8 May 2020
Revised: 18 August 2020
Accepted: 21 September 2020
First Online: 30 September 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study was conducted in accordance with the tenets of the Declaration of Helsinki; the research protocol was approved by the Institutional Review Board of Ajou University School of Medicine, Suwon, South Korea (AJIRB-MED-OBS-20-096).
: The need for informed consent was waived because this was a retrospective observational study using pre-existing medical records and imaging.