1. Peritoneal Dialysis Unit, “Laiko” General Hospital of Athens, Athens, Greece and Hellenic Open University, Greece
2. Department of Nursing, University of Thessaly, Larissa, Greece
3. Nephrology Clinic, “Laiko” General Hospital of Athens, Athens, Greece
4. Department of Nursing, University of Thessaly, Larissa, Greece and Hellenic Open University, Greece