Frequency and Duration of the Clinical Symptoms of Patients With Mild COVID-19: A Comparison With Influenza in the 2023-2024 Japanese Influenza Season, an Observational Study. - Bando T; Ikematsu H; Kawai N; Maeda T; Lee WJ; Matsuura S; Tanaka O; Kawashima T; Yamamoto H; Sato I; Doniwa KI (Health science reports, 2026)