1. Division of Nephrology; University Hospital Zurich; Zurich Switzerland
2. Division of Nephrology; Kantonsspital Aarau; Aarau Switzerland
3. Institute of Pathology and Molecular Pathology; University Hospital Zurich; Zurich Switzerland
4. Department of Radiology; Ospedale San Giovanni; Bellinzona Switzerland
5. Division of Nephrology; Ospedale San Giovanni; Bellinzona Switzerland
6. Institute of Medical Microbiology; University of Zurich; Zurich Switzerland
7. Division of Infectious Diseases and Hospital Epidemiology; University Hospital Zurich; Zurich Switzerland
8. Department of Internal Medicine; Cantonal Hospital Graubuenden; Chur Switzerland