Middle ear ventilation tubes.
D002675:Child, Preschool; D004432:Ear, Middle; D006314:Hearing Loss, Conductive / Q000209:etiology / Q000628:therapy; D006801:Humans; D007223:Infant; D007440:Intubation; D008722:Methods; D010033:Otitis Media / Q000601:surgery*; D010034:Otitis Media with Effusion / Q000150:complications / Q000601:surgery*; D014432:Tympanic Membrane / Q000601:surgery*