1. Institute for Clinical Diabetology; German Diabetes Center; Düsseldorf; Germany
2. West-German Centre of Diabetes and Health; Düsseldorf Catholic Hospital Group; Düsseldorf; Germany
3. Department of Chronic Disease Prevention; National Institute for Health and Welfare; Helsinki; Finland
4. Department of Internal Medicine II - Cardiology; University of Ulm Medical Center; Ulm; Germany
5. Hjelt Institute, Department of Public Health; University of Helsinki; Helsinki; Finland