1. Shiga T, Wajima Z, Inoue T et al (2005) Predicting difficult intubation in apparently normal patients: A metaanalysis of bedside screening test performance. Anesthesiology 103:429–437
2. Tong DC, Litman RS (2007) The Children’s Hospital of Philadelphia Difficult Intubation Registry (abstract P43). Society for Pediatric Anesthesia. Pediatric Anesthesiology (Winter Meeting), Phoenix, AZ
3. SIAARTI Study Group difficult airway (2005) Recommendations for airway control and difficult airway management. Min Anest 71:617–657
4. SIAARTI Study Group difficult airway (2006) Recommendations for airway control and difficult airway management in paediatric patients. Min Anest 72:723–748
5. Sarnaik A, Heidemann SM (2007) Respiratory pathophysiology and regulation. In: Kleigman RM, Rehrman RE, Jenson HB (eds) Nelson textbook of pediatrics (18th edition). WB Saunders, Philadelphia, PA, pp 1719–1731