1. Department of Surgical Gastroenterology Copenhagen University Hospital Amager Hvidovre Hvidovre Denmark
2. Section for Nursing, Department of Public Health University of Aarhus Aarhus Denmark
3. Department of Clinical Research University of Southern Denmark Odense Denmark
4. School of Health Sciences, Faculty of Nursing and Midwifery University of Iceland Reykjavik Iceland
5. Faculty of Social Sciences, health sciences Tampere University Tampere Finland
6. Department of Paediatrics and Adolescent Medicin Copenhagen University Hospital Amager Hvidovre Hvidovre Denmark