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