title: Evidence of surface-active agent in the Eustachian tube.
mesh_terms: D000818:Animals; D004432:Ear, Middle / Q000502:physiology; D005064:Eustachian Tube / Q000502:physiology*; D006168:Guinea Pigs; D008365:Manometry; D010033:Otitis Media / Q000209:etiology; D011312:Pressure; D013501:Surface-Active Agents
chemical_list: D013501:Surface-Active Agents