Kim, Byoung-Gwon
Kim, Ga Yeon
Cha, Jae-Kwan
Article History
Received: 25 November 2020
Accepted: 31 January 2021
First Online: 13 February 2021
Ethics approval and consent to participate
: Institutional Review Board of Dong-A University Hospital approved a request to waive of informed consent because it is not practicable to obtain consent from large numbers of patients for a retrospective chart review study, generally it also will not be appropriate to attempt to contact those patients to tell them about the study retrospectively. This study was approved by the Institutional Review Board of Dong-A University Hospital (DAUHIRB-17-149).
: Not applicable.
: The authors declare that they have no competing interests.