Funding for this research was provided by:
National Research Foundation of Korea (2017R1A6A3A110335)
Text and Data Mining valid from 2019-03-20
Received: 7 September 2018
Accepted: 5 March 2019
First Online: 20 March 2019
Ethics approval and consent to participate
: Study protocols were approved by Institutional Review Boards of Ewha Womans University (Seoul), Dankook University Hospital (Cheonan), and Ulsan University Hospital (Ulsan).
: Not applicable.
: The authors declare that they have no competing interests.
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