1. Department of Anaesthesia and Intensive Care Medicine; Hvidovre Hospital, Copenhagen University Hospital; Hvidovre Denmark
2. Copenhagen Trial Unit; Centre for Clinical Intervention Research; University of Copenhagen; Copenhagen Denmark
3. Department of Anaesthesia and Intensive Care Medicine; Herlev Hospital; Herlev Denmark
4. Department of Paediatric and Obstetric Anaesthesia; Juliane Marie Center; Copenhagen University Hospital; Copenhagen Denmark