Funding for this research was provided by:
Rural Development Administration (PJ010838062016)
Article History
Received: 8 November 2017
Accepted: 27 March 2018
First Online: 6 April 2018
Compliance with Ethical Standards
:
: Beom-Gyun Jeong declares that he/she has no conflict of interest. Geumju Mun declares that he/she has no conflict of interest. Jiyoung Jung declares that he/she has no conflict of interest. Jiyeon Chun declares that he/she has no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: Not applicable.