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Article History

Received: 5 April 2021

Accepted: 16 July 2021

First Online: 20 July 2021

Declarations

:

: Each author certifies that he or she has no commercial association (e.g. consultancies, stock ownership, equity interest, patent, licensing arrangements, etc.) that might pose a conflict of interest in connection with the submitted article.

: This study was approved by the Institutional Review Board (IRB) of Himchan hospital, Seoul, Republic of Korea.

: All patients provided written informed consent to use their medical records in advance.