1. Department of Nephrology; University Medical Center Groningen; University of Groningen; Groningen The Netherlands
2. Department of Epidemiology; University Medical Center Groningen; University of Groningen; Groningen The Netherlands
3. Department of Internal Medicine; University Medical Center Groningen; University of Groningen; Groningen The Netherlands
4. Department of Medical and Clinical Psychology; Center of Research on Psychology in Somatic Diseases; Tilburg University; Tilburg The Netherlands
5. Division of Human Nutrition; Wageningen University; Wageningen The Netherlands