Acoustic Impedance TestsOtoscopyOtitis Media with EffusionOtoscopesEar, MiddleHearing Loss, ConductiveOtitis MediaOtoacoustic Emissions, SpontaneousOtolaryngologyHearing TestsReflex, AcousticEar CanalAudiometry, Pure-ToneHearing DisordersTympanic MembraneMiddle Ear VentilationAudiometryTympanic Membrane PerforationEustachian TubeHearing LossNeonatal ScreeningHearingEvoked Potentials, Auditory, Brain StemAuditory ThresholdDenmarkReference ValuesProspective Studies