Funding for this research was provided by:
Rural Development Administration, Republic of Korea (PJ 012802022018)
Received: 27 June 2019
Accepted: 22 August 2019
First Online: 18 November 2019
Ethics approval and consent to participate
: The study protocol was approved by the institutional review board at Gangnam Severance Hospital, Yonsei University of Korea (3–2017-0077). Participants will provide written informed consent for participation.
: Not Applicable.
: The authors declare that they have no competing interests.