2.2 Data Collection
Clinical information was collected during hospitalization by attending
physicians. The radiologic results including chest radiography or
computed tomography (CT) were retrieved from the radiology information
system documents. Patient data, including demographics, medical history,
comorbidities, laboratory examinations, viral load, SARS-CoV-2-specific
IgG and IgM antibodies, and outcomes were collected from electronic
medical records and analyzed.