1. Department of Health Psychology; University Medical Center Groningen; University of Groningen; The Netherlands
2. Department of Psychology; Carnegie Mellon University; Pittsburgh Pennsylvania USA
3. Department of Health Sciences; Division of Community and Occupational Medicine; University Medical Center Groningen; University of Groningen; The Netherlands
4. Dialysis Center Groningen; The Netherlands
5. Department of Abdominal Surgery; University Medical Center Groningen; University of Groningen; The Netherlands
6. Department of Internal Medicine; University Medical Center Groningen; University of Groningen; The Netherlands