1. Department of Clinical Microbiology, Aarhus Municipal Hospital,1 and
2. Department of Internal Medicine, Horsens County Hospital, DK-8700 Horsens,2 and
3. Department of Clinical Biochemistry, Skejby Hospital, DK-8200 Aarhus N,3 Denmark
4. Department of Infectious Diseases, Marselisborg Hospital,4DK-8000 Aarhus,