1. Molecular Endocrinology Group (E.M., G.R.W.), Department of Medicine, and Medical Research Council Clinical Sciences Centre, Imperial College London, London W12 0NN, United Kingdom
2. Universitätsklinikum Schleswig-Holstein (C.C.G.), 24105 Kiel, Germany
3. Division of Applied Medicine (D.M.R.), School of Medicine and Dentistry, University of Aberdeen, Aberdeen AB25 2ZD, United Kingdom
4. Free University of Berlin (D.F.), 12200 Berlin, Germany
5. Paris Descartes University (C.R.), 75014 Paris, France
6. University of Sheffield (R.E.), Sheffield S5 7AU, United Kingdom