[1] Univ London, Inst Child Hlth, London WC1N 1EH, England
[2] Great Ormond St Hosp Sick Children, London Ctr Paediat Endocrinol & Metab, London WC1N 3JH, England
[3] Univ Sheffield, Inst Mol Physiol, Sheffield S10 2TN, S Yorkshire, England
[4] Univ Sheffield, Dept Biomed Sci, Sheffield S10 2TN, S Yorkshire, England
[5] Hop Necker Enfants Malad, Metab Unit Pediat, F-75015 Paris, France
[6] Hop Necker Enfants Malad, Dept Radiol, F-75015 Paris, France
[7] Hop Necker Enfants Malad, Dept Surg, F-75015 Paris, France
[8] Childrens Hosp, Natl Ctr Inherited Metab Disorders, Dublin 1, Ireland