Received: 3 December 2019
Accepted: 9 December 2020
First Online: 21 December 2020
Ethics approval and consent to participate
: This study was approved by the Korean Military Manpower Administration, and patients’ details were anonymized in a secure database. As this study was a registry-based retrospective cohort study, informed consent was not obtained.
: Not applicable.
: The authors declare that they have no competing interests.