Funding for this research was provided by:
Ministry of Science, ICT and Future Planning (NRF-2013R1A2A2A01068457)
Text and Data Mining valid from 2019-04-03
Received: 1 December 2018
Accepted: 27 March 2019
First Online: 3 April 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Ethical Committee of Asan Medical Center (No.: 2018–0531). Informed consent was obtained from all participants in a written form.
: Not applicable.
: The authors declare they have no competing interests.
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