1. Academic Unit of Ophthalmology, School of Immunity and Infection (A.J.S., M.A.B., P.I.M., S.R.), College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom;
2. Centre for Endocrinology, Diabetes and Metabolism, School of Clinical and Experimental Medicine (A.J.S., E.A.W., B.A.H., P.M.S., J.W.T.), College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom;
3. Departments of Endocrinology (A.P.v.B.) University Medical Centre Groningen, University of Groningen, 9700 RB Groningen, The Netherlands
4. Laboratory Medicine (I.P.K.), University Medical Centre Groningen, University of Groningen, 9700 RB Groningen, The Netherlands
5. Wellcome Trust Clinical Research Facility (P.G.N.), College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom;