2.2 COVID-19 patients
We performed a retrospective study on eligible patients with COVID-19
from August 2020 to July 2021.
During the study period, 188 confirmed patients were admitted, and 109
of these patients were analysed in the present study
(Supplemental table 2 ). The study was approved by the
Institutional Review Board (IRB) at the Jeju National University
Hospital (IRB file no. 2020-10-019), and the study design and baseline
characteristics of COVID-19 patients are available in theSupplemental Data 2 .