Yum, Sook Kyung http://orcid.org/0000-0001-8589-3159
Im, Soo Ah http://orcid.org/0000-0002-1264-3690
Seo, Yu Mi http://orcid.org/0000-0002-9846-9602
Sung, In Kyung http://orcid.org/0000-0002-9119-0887
Article History
Received: 24 May 2019
Accepted: 26 November 2019
First Online: 13 December 2019
Competing interests
: The authors declare no competing interests.