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Article History

Received: 18 March 2019

Revised: 29 May 2019

Accepted: 5 June 2019

First Online: 24 July 2019

Compliance with ethical standards

:

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

: All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional research committee (Seoul National University Bundang Hospital, B-1903-526-105) and with the 1964 Helsinki declaration and its later amendments.

: Informed consent was obtained from all individual participants included in the study.