Funding for this research was provided by:
National foundation of Korea (NRF-2016R1D1A1B01011002)
Article History
Received: 26 September 2019
Accepted: 8 July 2020
First Online: 14 July 2020
Ethics approval and consent to participate
: The authors assert that all the procedures contributing to this work comply with the ethical standards of the relevant national guidelines on human experimentation and with the Helsinki declaration, and have been approved by the institutional ethics committees (IRB No. 4–2017-0308/KC17QEDI0330). Participants took part in the present study after providing written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.