1. Centers for Diabetes and Metabolic Medicine and Academic Surgery, Institute of Cell and Molecular Science (W.B.O., B.J.B., S.A.B., N.M., G.A.H.) London E1 1BB, United Kingdom
2. Clinical and Molecular Endocrinology, William Harvey Institute (J.M.B.) London E1 1BB, United Kingdom
3. Queen Mary’s School of Medicine and Dentistry, University of London and Department of Clinical Chemistry (K.N.), Barts and The London National Health Service Trust, Royal London Hospital, London E1 1BB, United Kingdom