1. Departments of Metabolic Medicine (C.W.l.R., M.P., C.M.B., K.J.W., A.K., R.P.V., J.G., M.A.G., S.R.B.), Hammersmith Hospital, Imperial College London, London W12 0NN, United Kingdom
2. Department of Endocrinology (R.L.B.), University College London, London WC1E 6BT, United Kingdom
3. Department of Endocrinology (S.J.B.A.), King’s College Hospital, London SE5 9RS, United Kingdom