1. Herlev and Gentofte Hospital, University of Copenhagen; Department of Anaesthesiology; Herlev Ringvej 75 Herlev Denmark 2730
2. Herlev and Gentofte Hospital, University of Copenhagen; Department of Urology; Herlev ringvej Herlev Denmark 2710
3. Rigshospitalet, The Abdominal Centre; Department of Nursing Research; Blegdamsvej 9 Copenhagen Denmark 2200
4. Herlev and Gentofte Hospital, University of Copenhagen; The Cochrane Anaesthesia, Critical and Emergency Care Group; Herlev Ringvej Herlev Denmark 2730