1. Diabetes and Obesity Research Program, Garvan Institute of Medical Research, Sydney 2010, Australia
2. The Cambridge Institute of Medical Research and Department of Clinical Biochemistry, University of Cambridge, Cambridge CB2 0XY, UK
3. Department of Medical Physiology, University of Copenhagen, the Panum Institute, Copenhagen DK-2200, Denmark
4. Faculty of Medicine, University of New South Wales, Sydney 2052, Australia
5. Department of Endocrinology and Diabetes Center, St. Vincent's Hospital, Sydney 2010, Australia