1. Gastrounit Surgical Division Copenhagen University Hospital Amager Hvidovre Hvidovre Denmark
2. Graduate School of Health University of Aarhus Graduate School of Health Sciences Aarhus N Denmark
3. Department of Clinical Research University of Southern Denmark Odense Denmark
4. Faculty of Nursing University of Iceland Reykjavik Iceland
5. Faculty of Health and Medical Science University of Copenhagen Copenhagen Denmark
6. Department of Paediatrics and Adolescent Medicine Copenhagen University Hospital Amager Hvidovre Denmark
7. Section for Nursing Department of Public Health University of Aarhus Aarhus Denmark