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URL: http://scholar.google.com/scholar_lookup?title=Epithelial+cells%2C+the+%E2%80%9Cswitchboard%E2%80%9D+of+respiratory+immune+defense+responses%3A+effects+of+air+pollutants&year=2012&author=M%C3%BCller&journal=Swiss+Med+Wkly&volume=142&pmid=22851042