1. Division of Clinical Nephrology, Department of Internal Medicine, Innsbruck University Hospital, Innsbruck, Austria,
2. Institute of Hygiene and Social Medicine, University of Innsbruck, Innsbruck, Austria
3. Division of Clinical Nephrology, Department of Internal Medicine, Innsbruck University Hospital, Innsbruck, Austria
4. Department of Neurology, Innsbruck University Hospital, Innsbruck, Austria
5. Department of Diagnostic Radiology I, Innsbruck University Hospital, Innsbruck, Austria
6. Department of Internal Medicine, Brixen Hospital, Brixen, Italy