Funding for this research was provided by:
National Research Foundation of Korea (2015R1A5A2009124 and 2016M3A9B6903321)
Ministry of Education (2017R1D1A1B03027831)
Korea Health Industry Development Institute (HI18C0453)
Creative Economy Leading Technology Development Program (SF316001A)
Text and Data Mining valid from 2019-10-16
Received: 27 January 2019
Revised: 29 April 2019
Accepted: 11 July 2019
First Online: 16 October 2019
Ethics approval and consent to participate
: Not applicable
: Not applicable.
: The authors declare that they have no competing interests.