1. Department of Anaesthesiology and Intensive Care Medicine; Copenhagen University Hospital; Herlev; Denmark
2. Department of Anaesthesiology; Vejle Hospital; Vejle; Denmark
3. Department of Anaesthesiology Day Surgery Unit; Aarhus University Hospital; Aarhus; Denmark
4. Department of Anaesthesiology; Hospital of Southern Jutland; Aabenraa; Denmark
5. Department of Anaesthesiology; Regional Hospital; Herning; Denmark
6. Department of Anaesthesiology; Regional Hospital; Horsens; Denmark