Funding for this research was provided by:
Hallym University Research Fund (HURF-2016-07)
Article History
Accepted: 13 August 2018
First Online: 5 September 2018
Compliance with ethical standards
: We the authors, Drs. Lee Seon Heui, Kim Dong Hyun, and Lim Sang Woo, have complied with all applicable ethical standards.
: The authors declare that they have no conflicts of interest.