1. Large airway obstruction in children. Part 1: causes and assessment;Morton;Royal College of Anaesthetists Newsletter,1999
2. Acute and chronic airway obstruction;Bew;Anaesth Intensive Care Med,2006
3. Acute upper airway obstruction: croup, epiglottitis, bacterial tracheitis and retropharyngeal abscess;Al-Jundi,1997
4. Pediatric intensive care;Downes;Anesthesiology,1975