1. Department of Cardiology; Aarhus University Hospital; Skejby 8200 Aarhus N Denmark
2. The Water and Salt Research Center; Aarhus University Hospital; Skejby Denmark
3. Molecular Diagnostic Laboratory, Department of Clinical Biochemistry; Aarhus University Hospital; Skejby Denmark
4. Stark Diabetes Center, Division of Endocrinology; University of Texas Medical Branch; Galveston TX USA
5. The Medical Research Laboratories, Clinical Institute, Medical Department M (Diabetes and Endocrinology); Aarhus University Hospital; Skejby Denmark