Affiliation: | (1) Department of Diagnostic Radiology, Guy's Hospital, London, England;(2) Present address: Prince of Wales Hospital, Chinese University of Hong Kong, Hong Kong;(3) Department of Diagnostic Radiology, Guy's Hospital, England;(4) Present address: Department of Diagnostic Radiology, Addenbrooke's Hospital, Cambridge, England;(5) Department of Diagnostic Radiology, Hospital for Sick Children, Great Ormond Street, London, England;(6) Department of Paediatrics, Guy's Hospital, London, England |