Funding for this research was provided by:
Ministry of Health & Welfare, Republic of Korea (HI19C0481, HC19C0276)
Received: 12 July 2020
Accepted: 20 January 2021
First Online: 26 January 2021
Ethics approval and consent to participate
: This study adhered to the Declaration of Helsinki and was approved by the Chonnam National University Hospital Institutional Review Board. Written informed consents were obtained after the subjects were fully informed of the purposes of this study.
: Not applicable (no identifying patient data).
: The authors declare that they have no competing interests.