title: Letter: Upper airway obstruction.
mesh_terms: D000293:Adolescent; D000402:Airway Obstruction / Q000209:etiology* / Q000628:therapy; D001803:Blood Transfusion; D006801:Humans; D008297:Male; D009060:Mouth Floor; D006472:Oral Hemorrhage / Q000150:complications*; D012805:Sickle Cell Trait / Q000150:complications; D014140:Tracheotomy