title: Assessment of long-term middle ear ventilation.
mesh_terms: D000158:Acoustic Impedance Tests; D001299:Audiometry; D002648:Child; D002675:Child, Preschool; D006801:Humans; D008876:Middle Ear Ventilation / Q000009:adverse effects; D010033:Otitis Media / Q000175:diagnosis / Q000473:pathology / Q000601:surgery*; D014432:Tympanic Membrane / Q000473:pathology