Fig. 1From: Pilot study for risk assessment of aspiration pneumonia based on oral bacteria levels and serum biomarkersLevel of substance P. Abbreviations: AP, aspiration pneumonia group; Con, control group; CAP, community-acquired pneumonia group. The blood of patients was collected using EDTA-Na plus aprotinin tubes. After purification, as described in the Methods section, the level of substance P in the plasma was measured by using specific ELISA kitsBack to article page