title: Letter: Humidity and ciliary activity.
mesh_terms: D001285:Atropine / Q000494:pharmacology; D002923:Cilia / Q000187:drug effects / Q000502:physiology*; D005260:Female; D006801:Humans; D006813:Humidity; D011247:Pregnancy; D014132:Trachea / Q000502:physiology*
chemical_list: D001285:Atropine