MasksLaryngeal MasksRespiratory Protective DevicesIntubation, IntratrachealPerceptual MaskingAir PressureManikinsEquipment DesignFiber Optic TechnologyDisposable EquipmentAnesthesia, GeneralPositive-Pressure RespirationLaryngoscopyRespiration, ArtificialCricoid CartilageAirway ObstructionDramaRespiratory InsufficiencyAnesthesia, InhalationTidal VolumeOxygen Inhalation TherapyInhalation SpacersProtective ClothingContrast SensitivitySensory ThresholdsNoninvasive VentilationPharyngitisLaryngismusAerosolsPsychophysicsLarynxNeuromuscular BlockadeIntermittent Positive-Pressure VentilationEye Protective DevicesVentilators, MechanicalPressureAnesthesiaEpiglottisNebulizers and VaporizersIntubationPhotic StimulationTime FactorsCross-Over StudiesPattern Recognition, VisualAirway ManagementSubliminal StimulationImmobilizationPneumonia, AspirationContinuous Positive Airway PressureInfectious Disease Transmission, Patient-to-Professional