Funding for this research was provided by:
Korea Health Industry Development Institute (HI15C0001)
National Research Foundation of Korea (2017R1A2B4003328, 2017R1C1B5076710)
Article History
Received: 10 December 2019
Accepted: 21 May 2020
First Online: 30 May 2020
Competing interests
: The authors declare that they have no competing interests.