Song, Hyeon Ji
Lee, Jin Ho
Jeong, Hyun-Cheol
Choi, Eun-Jung
Oh, Taek-Keun
Hong, Chang-Oh
Kim, Pil Joo
Funding for this research was provided by:
Rural Development Administration (PJ014205032019)
Ministry of Education and Human Resources Development
Article History
Received: 7 August 2019
Accepted: 8 November 2019
First Online: 20 November 2019
Competing interests
: The authors declare that they have no competing interests.