0036-3634 0036-3634 S0036-36342018000300021 10.21149/8852 Korea South Korea 00 06 2018 00 06 2018 60 3 370 372 1 2017 376 20 20 1943-55 2 2012 41 8 8 20-6 3 2005 330 7486 7486 301-4