1. Department of Paediatrics (F.M.R., R.M.W., A.M., C.L.A., R.H., D.B.D.), The University of Cambridge, Cambridge CB2 0QQ, United Kingdom
2. Diabetes and Endocrinology (A.M.U.), Postgraduate Medical School, University of Surrey, Guildford GU2 7WG, United Kingdom
3. Institute of Metabolic Science (C.L.A., S.O., R.H., R.K.S., D.B.D.), The University of Cambridge, Cambridge CB2 0QQ, United Kingdom