Fig. 2From: Extracellular vesicles and chronic obstructive pulmonary disease (COPD): a systematic reviewResults of the literature search. The graphs show the numer of publications (A) per year since the first publication in 2011, B according to the cell origin of EVs and C according to the biological material in which the EVs were studied. BALF broncoalveolar lavage fluid, PLF peritoneal lavage fluid, EBC exhaled breathe condensateBack to article page