Kug, Jong-Seong
Jeong, Jee-Hoon
Jang, Yeon-Soo
Kim, Baek-Min
Folland, Chris K.
Min, Seung-Ki
Son, Seok-Woo
Article History
Received: 16 February 2015
Accepted: 23 July 2015
First Online: 31 August 2015
Competing interests
: The authors declare no competing financial interests.