1. Herlev University Hospital; Department of Internal Medicine; Herlev Ringvej 75 Herlev Denmark DK-2730
2. Gentofte Hospital, University of Copenhagen; Center for Diabetes Research, Department of Medicine; Kildegaardsvej 28 Hellerup Denmark DK-2900
3. Institute of General Practice, Medical Faculty of the Heinrich-Heine-University Düsseldorf; Cochrane Metabolic and Endocrine Disorders Group; Moorenstr. 5 Düsseldorf Germany 40225