1. Third Department of Internal Medicine, General University Hospital and First Faculty of Medicine, Charles University, Prague - Czech Republic
2. Department of Cardiovascular Surgery, General University Hospital and First Faculty of Medicine, Charles University, Prague - Czech Republic
3. Department of Internal Medicine, Division of Nephrology, Viecuri Hospital, Venlo - The Netherlands
4. Department of Surgery, University Hospital Maastricht, Maastricht - The Netherlands
5. Department of Nephrology; AZ St Lucas, Ghent - Belgium