Heo, Jaesung
Noh, O Kyu
Oh, Young-Taek
Chun, Mison
Kim, Logyoung
Article History
Received: 15 March 2018
Accepted: 19 October 2018
First Online: 6 November 2018
Ethics approval and consent to participate
: This study was approved by the institutional review board (IRB) of Ajou University Hospital (IRB No. AJIRB-MED-EXP-16-493). The requirement for informed consent was waived because the study was a retrospective analysis of claims data from the HIRA. All patients in the HIRA dataset were anonymously recorded.
: Not applicable.
: The authors declare that they have no competing interests.
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