1. Pediatric Pain Treatment Service Astrid Lindgren Children's HospitalKarolinska University Hospital Stockholm Sweden
2. Department of Physiology and Pharmacology Karolinska Institutet Stockholm Sweden
3. Pediatric Perioperative Medicine and Intensive Care Karolinska University Hospital Stockholm Sweden
4. Clinical Pharmacology Unit Department of Medicine Karolinska Institutet Stockholm Sweden
5. Department of Women's and Children's Health Karolinska Institutet Stockholm Sweden