1. Oslo University Hospital,Department of Clinical and Biomedical Engineering,Oslo,Norway
2. University of Oslo,Department of Physics,Oslo,Norway
3. Oslo University Hospital,Department of Neurology,Oslo,Norway
4. Oslo University Hospital,Department of Transplantation Medicine,Oslo,Norway
5. Oslo University Hospital,Department of Vascular Surgery,Oslo,Norway
6. Oslo University Hospital,Morbid Obesity and Preventive Medicine,Department of Endocrinology,Oslo,Norway