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Article History

Received: 31 December 2018

Accepted: 2 April 2019

First Online: 14 May 2019

Ethics approval and consent to participate

: The animal study plan and protocol were approved by the Biomedical Research Institute of Seoul National University Hospital (15–0111-C1A0). The human study protocol was reviewed and approved by the institutional review board of Seoul National University Hospital (1312–051-542). Informed consent was exempted because of the retrospective nature of the study and minimal risk of harm to the study subjects. This study was performed in accordance with the recommendations of the Declaration of Helsinki (2013) for biomedical research involving human subjects.

: Not applicable.

: The authors declare that they have no competing interests.

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