Funding for this research was provided by:
Seoul National University Hospital (04-2016-0460)
Received: 13 November 2018
Accepted: 1 February 2019
First Online: 7 February 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of Seoul National University Hospital (reference number H-1609-103793). Obtaining additional informed consent for the use of patient samples was not required, as determined by the Institutional Review Board.
: Not applicable.
: The authors declare that they have no competing interests.
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