title: Increasing the margin of safety in positioning left-sided double-lumen endotracheal tubes.
authors.forename: D D
authors.initials: DD
authors.lastname: Alfery
mesh_terms: D005260:Female; D006801:Humans; D007442:Intubation, Intratracheal / Q000295:instrumentation / Q000379:methods*; D008297:Male; D012449:Safety