Funding for this research was provided by:
National Research Foundation of Korea (NRF-2018R1D1A1B07048210, NRF-2019R1I1A1A01043771)
Article History
Received: 29 January 2020
Accepted: 13 April 2020
First Online: 19 April 2020
Ethics approval and consent to participate
: The Sungkunwan University institutional review board of human study reviewed and approved the study protocol (SKKU 2017–06-009). Written informed consent was obtained from all participants.
: No applicable.
: The corresponding author (HK) declares that he currently serves as an associate editor of this journal.