1. Institute of Health; Section of Nursing Science; Aarhus University; Aarhus Denmark
2. Region Zealand; Slagelse Hospital; Slagelse Denmark
3. Research Unit of Nursing; Institute of Clinical Research; University of Southern Denmark; Odense M Denmark
4. Department of Anaesthesiology; Aarhus University Hospital; Aarhus Denmark
5. Section of Health Services Research Lillebaelt Hospital/University of Southern Denmark; Vejle Denmark