Funding for this research was provided by:
National Research Foundation of Korea (2018R1A2B2007694, 2017R1A6A3A03012461, 2018R1C1B6004521)
Korea Health Industry Development Institute (HI14C1090)
University of Sydney (192237)
Text and Data Mining valid from 2019-04-15
First Online: 15 April 2019
<!--Emphasis Type='BoldItalic' removed-->Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.