Ear, MiddleChinchillaOtitis MediaLabyrinthitisCholesteatoma, Middle EarInflammationEarOtitis Media with EffusionEar OssiclesTympanic MembraneEar DiseasesEar, InnerEustachian TubeMiddle Ear VentilationEar NeoplasmsEar CanalAcoustic Impedance TestsEar, ExternalMalleusStapesOtoscopyMastoidTemporal BoneIncusHearing Loss, ConductiveOtologic Surgical ProceduresOssicular ProsthesisTympanoplastyStapediusInflammation MediatorsRound Window, EarTensor TympaniHearingBone ConductionHaemophilus influenzaeDisease Models, AnimalHearing LossTympanic Membrane PerforationStapes SurgeryOtitis Media, SuppurativeCholesteatomaEar CartilageMice, Inbred C57BLStreptococcus pneumoniaeOtoacoustic Emissions, SpontaneousHaemophilus InfectionsCochleaHearing Loss, Mixed Conductive-SensorineuralOtosclerosisNasopharynx