1. Department of Clinical Pharmacology; University of Groningen; University Medical Center Groningen; Groningen the Netherlands
2. Biocrates Life Sciences AG; Innsbruck Austria
3. Steno Diabetes Center; Gentofte Denmark
4. Division of Nephrology; University Medical Center Groningen; Groningen the Netherlands
5. Univeristy of Aarhus; Aarhus Denmark
6. Center for Basic Metabolic Research; University of Copenhagen; Copenhagen Denmark