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Article History

Received: 5 September 2018

Accepted: 27 March 2019

First Online: 3 April 2019

Competing interest

: The authors declare that they have no competing interest.

: This study was approved by the Institutional Review Board of Chosun University Hospital (2018–05–005-002), Chonnam University Hospital (CNUH-2018-147), and Severence Hospital (4–5017-550). A prior signed informed consent was obtained from each patient. All of the procedures were performed in accordance with the relevant policies in South Korea and adhered to the tenets of the Declaration of Helsinki.

: Not applicable.

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