Difficult intubation.
D000328:Adult; D000367:Age Factors; D020680:Bronchoscopes; D002648:Child; D002675:Child, Preschool; D005336:Fiber Optic Technology / Q000295:instrumentation; D006801:Humans; D007223:Infant; D007442:Intubation, Intratracheal / Q000295:instrumentation / Q000379:methods; D020704:Laryngoscopes; D009666:Nose; D011187:Posture; D014132:Trachea / Q000033:anatomy & histology