Funding for this research was provided by:
Korea Health Industry Development Institute (HI17C0335)
Text and Data Mining valid from 2018-10-31
Received: 8 June 2018
Accepted: 16 October 2018
First Online: 31 October 2018
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of Seoul National University Hospital in Korea (approval number H-1012-080-344). The study protocol followed the tenets of the Declaration of Helsinki. All subjects signed written informed consent for use of material and clinical information for research purposes.
: Not applicable
: The authors declare that they have no competing interests.
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