1. Division of Anaesthesia and Intensive Care; Danderyd Hospital; Department of Clinical Sciences; Karolinska Institutet; Stockholm; Sweden
2. Childhood Cancer Research Unit; Department of Women's and Children's Health; Karolinska Institutet; Stockholm; Sweden
3. Department of Oncology-Pathology; Karolinska Institutet; Stockholm; Sweden
4. Section of Anaesthesiology and Intensive Care; Department of Physiology and Pharmacology; Karolinska Institutet; Stockholm; Sweden