1 Paediatric Centre for Hepatology, Gastroenterology and Nutrition, King's College Hospital, Denmark Hill, London SE5 9RS, UK. Electronic address: nedim.hadzic@kcl.ac.uk.
2 Institute of Liver Studies, King's College Hospital, London, UK.
3 Paediatric Centre for Hepatology, Gastroenterology and Nutrition, King's College Hospital, Denmark Hill, London SE5 9RS, UK.