1. Diabetes Research Centre, Leicester General Hospital, University of Leicester , Gwendolen Road, Leicester LE5 4WP , UK
2. Institute of Public Health and Clinical Nutrition, University of Eastern Finland , Yliopistonranta 1 C, Canthia building, B wing, FI-70211 Kuopio , Finland
3. Department of Medicine, Institute of Clinical Medicine, University of Eastern Finland, Kuopio University Hospital , FI-70029 Kuopio , Finland
4. Department of Medicine, Central Finland Health Care District , 40620 Jyväskylä , Finland