Funding for this research was provided by:
the National Research Foundation (NRF) funded by the Korean government (2018R1A2B6005347)
National Research Foundation (NRF) funded by the Korean government (2018R1D1A1B07045416)
National Research Foundation (2019M3E5D1A01068998)
Ministry of Health & Welfare, Republic of Korea (HI12C1852, HA17C0053, HR20C0021)
Korea University Guro Hospital grant (O1904001)
Received: 21 August 2020
Accepted: 12 November 2020
First Online: 20 November 2020
Consent for publication
: All authors have agreed to publish this manuscript.
: The authors declare that they have no competing interests.