Funding for this research was provided by:
National Research Foundation of Korea (2018R1A2B6001385, 2015R1D1A3A01017746)
Received: 12 August 2020
Accepted: 31 January 2021
First Online: 9 February 2021
Ethics approval and consent to participate
: Ethical approval for this study was obtained from Institutional Review Board (Yonsei University Wonju College of Medicine IRB No. 15–2-044). All participants voluntarily decided to participate and written informed consent was obtained. The urine collection tubes were labeled with an identification number. Written informed consent was also obtained from the participants.
: Not applicable.
: The authors declare that they have no competing interests.