Article History
Received: 10 May 2020
Revised: 28 August 2020
Accepted: 5 September 2020
First Online: 27 November 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This retrospective chart review study involving human participants was in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Approval was granted by the Institutional Review Board (IRB) at Severance Hospital prior to study initiation. Patient consent was waived by the IRB committee.
: Not applicable.