1. Centre for Endocrinology, Diabetes, and Metabolism (M.W.O., A.E.T., B.A.H., R.K.C., P.M.S., J.W.T., W.A.), School of Clinical and Experimental Medicine, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
2. Department of Nuclear Medicine (N.J.C.), University Hospitals Birmingham, Edgbaston, United Kingdom
3. National Institute of Health Research/Wellcome Trust Clinical Research Facility (F.C.), University Hospitals Birmingham National Health Service Foundation Trust, Birmingham B15 2TH, United Kingdom
4. University of Leeds (P.M.S.), Leeds, LS2 9NL, United Kingdom