MasksLaryngeal MasksRespiratory Protective DevicesIntubation, IntratrachealPerceptual MaskingAir PressureManikinsEquipment DesignFiber Optic TechnologyDisposable EquipmentAnesthesia, GeneralPositive-Pressure RespirationLaryngoscopyRespiration, ArtificialAirway ObstructionCricoid CartilageDramaRespiratory InsufficiencyAnesthesia, InhalationTidal VolumeOxygen Inhalation TherapyInhalation SpacersProtective ClothingContrast SensitivitySensory ThresholdsNoninvasive VentilationTime FactorsLaryngismusAerosolsPharyngitisPsychophysicsLarynxPressureNeuromuscular BlockadeVentilators, MechanicalIntermittent Positive-Pressure VentilationAnesthesiaEye Protective DevicesEpiglottisIntubationPhotic StimulationNebulizers and VaporizersPattern Recognition, VisualCross-Over StudiesImmobilizationProspective StudiesAirway ManagementPneumonia, AspirationSubliminal StimulationRespirationContinuous Positive Airway PressureAirInfectious Disease Transmission, Patient-to-Professional