Ho, Kum-Song
Im, Song-Jin http://orcid.org/0000-0001-6277-7200
Pae, Ji-Song
Ri, Chol-Song
Han, Yong-Ha
Herrmann, Joachim
Article History
Received: 21 February 2018
Accepted: 25 June 2018
First Online: 12 July 2018
Competing Interests
: The authors declare no competing interests.