1. Department of Paediatrics (A.T., P.H.T., C.A., D.E., R.M.W., D.B.D.), University of Cambridge, Addenbrooke's Hospital, Cambridge CB2 0QQ, United Kingdom
2. Department of Paediatrics (P.H.T.), University of Oulu, 90029 OYS, Oulu, Finland
3. Wolfson Brain Imaging Centre (A.S.), University of Cambridge, Addenbrooke's Hospital, Cambridge CB2 0QQ, United Kingdom
4. WellChild Laboratory (R.N.D.), King's College London, Evelina Children's Hospital, London SE1 7EH, United Kingdom
5. Diabetes and Metabolic Medicine (N.C.J., A.M.U.), Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7WG, United Kingdom
6. National Institute for Health Research Cambridge Comprehensive Biomedical Research Centre (D.B.D.), Cambridge, CB2 0QQ, United Kingdom