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Article History

Received: 13 April 2020

Revised: 7 July 2020

Accepted: 10 July 2020

First Online: 21 August 2020

Compliance with ethical standards

:

: The funding organization had played no role in the design or conduct of this research.

: The authors declare that they have no conflict of interest.

: All procedures performed in studies involving human participants were in accordance with the ethical standards of Seoul National University Bundang Hospital and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

: Informed consent was not given, as subject records and information were anonymized and de-identified prior to analysis.