Head position for opening the upper airway.
Greenberg
R S
RS
D000402:Airway Obstruction / Q000628:therapy*; D019416:Head Movements; D006801:Humans; D008279:Magnetic Resonance Imaging; D008397:Masks; D009333:Neck / Q000473:pathology; D012121:Respiration, Artificial / Q000379:methods*