Funding for this research was provided by:
National Research Foundation of Korea (2016R1D1A1A02937044)
Text and Data Mining valid from 2019-02-15
Received: 29 August 2018
Accepted: 4 February 2019
First Online: 15 February 2019
Ethics approval and consent to participate
: This study was approved by the institutional review boards and ethics committees at Seoul National University Hospital. All participants provided written informed consent.
: Not applicable
: The authors declare that they have no competing interests.
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