Funding for this research was provided by:
National Research Foundation of Korea (2016R1E1A1A01941212, 2017M3C7A1028949)
Korea Health Industry Development Institute (HI14C1913)
Article History
Received: 22 January 2020
Accepted: 18 May 2020
First Online: 8 June 2020
Competing interests
: The authors declare no competing interests.