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Correlation between particle size and poly-(ethylene) glycol (PEG)-lipid. (a) Effects of PEG-lipid molar ratio on particle size before nebulization. (b) Effects of type of PEG-lipid on particle size before nebulization (c) Effects of type of PEG-lipid on particle size after nebulization. (** p < 0.01, **** p < 0.0001).
