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The average size distribution of (A) the droplet emulsions and (B) the precursor microbubbles. The average concentration and the median size for OFP droplets were 2.8×1011 particles/mL and 171 nm, respectively; those for DFP droplets were 1.3×1011 particles/mL and 183 nm, respectively; those for microbubbles were 1.5×1010 particles/mL and 1.1 µm.
