Funding for this research was provided by:
National Research Foundation of Korea (2020R1A2C1008891)
Received: 24 February 2020
Accepted: 3 August 2020
First Online: 11 August 2020
Ethics approval and consent to participate
: The protocols of the study were reviewed and approved by the Institutional Review Board of Korea University (KU-IRB-17-36-A-2). Written informed consent was voluntarily obtained from all study participants prior to enrollment.
: Not applicable.
: The authors declare that they have no competing interests.