Harbin Medical University Harbin 150001 Heilongjiang Province China;
Harbin Medical University Harbin 150001 Heilongjiang Province China;
Department of Critical Care Medicine the Cancer Hospital of Harbin Medical University Harbin 150081 Heilongjiang Province China;
Harbin Medical University Harbin 150001 Heilongjiang Province China;
Harbin Medical University Harbin 150001 Heilongjiang Province China;
Harbin Medical University Harbin 150001 Heilongjiang Province China;
Harbin Medical University Harbin 150001 Heilongjiang Province China;
Harbin Medical University Harbin 150001 Heilongjiang Province China;
Harbin Medical University Harbin 150001 Heilongjiang Province China;
Harbin Medical University Harbin 150001 Heilongjiang Province China;
COVID-19; Initial symptoms; Gastrointestinal symptoms; Hospitalization; Viral transmission;