title: Where is the narrowest segment in the upper airway?
authors.forename: T
authors.initials: T
authors.lastname: Asai
authors.forename: K
authors.initials: K
authors.lastname: Shingu
mesh_terms: D000328:Adult; D000886:Anthropometry; D003413:Cricoid Cartilage / Q000033:anatomy & histology*; D005931:Glottis / Q000033:anatomy & histology; D006801:Humans; D007442:Intubation, Intratracheal