Ear, MiddleOtologic Surgical ProceduresOtosclerosisStapes SurgeryHypotension, ControlledCholesteatoma, Middle EarTympanoplastyTemporal BoneMastoidEarOtitis Media with EffusionEar OssiclesTympanic MembraneOtitis MediaEar DiseasesEar, InnerMiddle Ear VentilationEustachian TubeEar NeoplasmsEar CanalAnesthesia, GeneralChinchillaAcoustic Impedance TestsEar, ExternalMalleusStapesOtoscopyHearing Loss, ConductiveIncusOssicular ProsthesisStapediusRound Window, EarHearingTensor TympaniBone ConductionHaemophilus influenzae