1. Department of Occupational and Environmental Medicine; Telemark Hospital; Skien Norway
2. Clinic of Internal Medicine; Østfold Hospital Trust; Fredrikstad Norway
3. Unilabs Telelab AS; Skien Norway
4. Department of Environmental and Health Sciences; Telemark University College, Bø; Telemark Norway
5. Department of Medicine; Telemark Hospital; Skien Norway
6. Center for Laboratory Medicine; Østfold Hospital Trust; Fredrikstad Norway
7. Department of Medical Microbiology; Unilabs Telelab AS; Skien Norway
8. Department of Medical Biochemistry; Telemark Hospital; Skien Norway
9. Department of Research and Development; Telemark Hospital; Skien Norway