Upper airway Obstructive sleep apnea 2 article 2 controlled study 2 human 2 upper respiratory tract 2 3D printers 1 Adolescent 1 Aerodynamics 1 Airway pressures 1 Anatomical dead space 1 Child 1 Color 1 Color fidelity 1 Cone-Beam Computed Tomography 1 Cone-beam computed tomography 1 Dead space 1 Dead space washout 1 Denmark 1 Endoscopy 1 Female 1 Flexible endoscopes 1 Fluid flow 1 Functional appliance 1 High flow 1 Humans 1 Hypopharynx 1 Image enhancement 1 Image quality 1 Imaging, Three-Dimensional 1