Text and Data Mining valid from 2019-06-17
Received: 15 January 2019
Accepted: 6 June 2019
First Online: 17 June 2019
Compliance with ethical standards
: Drs. Eunae Cho, Chang-Hwan Park, Tae Hyeon Kim, Chang-Min Cho, Dong Wan Seo, Jaihwan Kim, Jun Ho Choi, and Sung-Hoon Moon have no conflicts of interest or financial ties to disclose.