1. Department of Drug Design and Pharmacology; Faculty of Health and Medical Sciences; University of Copenhagen; Copenhagen Denmark
2. Paediatric Pain Service; Department of Anaesthesiology; The Juliane Marie Centre; Copenhagen University Hospital Rigshospitalet; Copenhagen Denmark
3. Department of Gynaecology; Obstetrics and Paediatrics; Faculty of Health and Medical Sciences; University of Copenhagen; Copenhagen Denmark
4. Department of Paediatrics and Adolescent medicine; The Juliane Marie Centre; Copenhagen University Hospital Rigshospitalet; Copenhagen Denmark
5. Department of Anaesthesiology; University of Auckland; Auckland New Zealand
6. Pharmazentrum Frankfurt/ZAFES; Institut für Klinische Pharmakologie; Klinikum der Johann Wolfgang Goethe Universität; Frankfurt am Main Germany