Oh, Tak Kyu
Song, In-Ae
Article History
Received: 7 January 2020
Accepted: 3 June 2020
First Online: 16 June 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study protocol was approved by the Institutional Review Board of Seoul National University Bundang Hospital (X-1903-531-901) and the Health Insurance Review and Assessment Service (NHIS-2019-2-140). The requirement for informed consent was waived, because the study included anonymized data from the National Health Insurance Service (NHIS).