Fig. 1.

Top—definition of uncomplicated and complicated clinical stage. The respective stage is considered to be present if one of the criteria is met. Bottom—parameters included into Lean European Open Survey on SARS-CoV-2-Infected Patients (LEOSS). Sub-questionnaires under development at the time of submission of this manuscript are defined with asterisk (*). paO2 partial pressure of oxygen, SaO2 oxygen saturation, AST aspartate aminotransferase, ALT alanine transaminase, ULN upper limit of normal in the respective local laboratory, qSOFA quick sequential [sepsis-related] organ failure assessment