1. Department of Paediatrics (A.T., K.K.O., D.B.D.), University of Cambridge, Cambridge CB2 0QQ, United Kingdom
2. Medical Research Council Epidemiology Unit (K.K.O.), Institute of Metabolic Science, Cambridge CB2 0QQ, United Kingdom
3. Department of Paediatrics (M.L.A.), University of Oxford, Oxford OX1 2JD, United Kingdom
4. School of Oral and Dental Sciences (A.R.N.), University of Bristol, Bristol BS8 1TZ, United Kingdom
5. School of Clinical Science (J.M.P.H.), University of Bristol, Bristol BS8 1TZ, United Kingdom
6. National Institute for Health Research (D.B.D.), Cambridge Comprehensive Biomedical Research Centre, Cambridge CB2 0QQ, United Kingdom