1. Department of Nursing Sciences, Faculty of Medicine and Public Health; University of Antwerp; Antwerp Belgium
2. Department of Nephrology and Renal Transplantation; Hospital Clinic Barcelona; Barcelona Spain
3. Centre for Internal Medicine (ZIM); Dialysis Unit; Klinikum Garmisch-Partenkirchen Germany
4. Fresenius Medical Care Deutschland GmbH; Renal Pharmaceuticals; Bad Homburg Germany