Funding for this research was provided by:
National Research Foundation of Korea (NRF-2018R1C1B6008724)
Received: 11 May 2019
Accepted: 15 October 2019
First Online: 12 November 2019
Ethics approval and consent to participate
: This retrospective study was approved by the IRB of the Seoul St. Mary’s Hospital of the Catholic University of Korea (KC19RESI0114). The need for informed consent was waived by the IRB of the Seoul St. Mary’s Hospital of the Catholic University of Korea due to the study design as this was a retrospective review of medical records.
: Not applicable.
: The authors declare that they have no competing interests.