Kim, Taekyun
Kim, Dae San
Jang, Gwan-Woo
Kim, Dojin
Text and Data Mining valid from 2019-05-22
Version of Record valid from 2019-05-22
Article History
Received: 1 February 2019
Accepted: 14 May 2019
First Online: 22 May 2019
Competing interests
: The authors declare that they have no competing interests.