Funding for this research was provided by:
National Research Foundation of Korea (NRF-2017R1D1A1B03028811, NRF-2017M3A9E1064781)
Korea Health Industry Development Institute (HI17C2397)
Article History
Received: 18 April 2018
Revised: 29 October 2018
Accepted: 7 November 2018
First Online: 13 November 2018
Compliance with ethical standards
:
: The authors declare that they have no competing interests.