TAYLOR, T. H.; JENNINGS, A. M. C.; NIGHTINGALE, D. A.; BARBER, B.; LEIVERS, D.; STYLES, M.; MAGNER, J.; TAYLOR T. H.; The Hospital; JENNINGS A. M. C.; Northampton General Hospital; NIGHTINGALE D. A.; Alder Hey Children's Hospital; BARBER B.; Operational Research Unit, The London Hospital; LEIVERS D.; The London Hospital; STYLES M.; Northampton General Hospital; MAGNER J.; Alder Hey Children's Hospital