K T Tzifa FRCS DLO Y C Gan FRCS 1A D Hockley FRCS 1P S Wilson FRCS
Department of Otolaryngology, North Staffordshire Hospital, City General,
Newcastle Road, Stoke-on-Trent ST4 6QG, UK 1 Department of Paediatric Neurosurgery, Birmingham Children's Hospital,
Steelhouse Lane, Birmingham, UK