1 Department of Paediatric Perioperative Medicine and Intensive Care, Astrid Lindgren Children's Hospital, Karolinska University Hospital, Stockholm, Sweden; Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden. Electronic address: ulf.lindestam@regionstockholm.se.
2 Department of Clinical Interventions and Technology, Karolinska Institutet, Stockholm, Sweden; Department of Perioperative Medicine and Intensive Care, Karolinska University Hospital, Stockholm, Sweden.
3 Department of Anaesthesia and Intensive Care, Section of Paediatric Anaesthesia and Intensive care, Uppsala University Hospital, Uppsala, Sweden; Department of Surgical Sciences, Section of Anaesthesiology and Intensive Care Medicine, Uppsala University, Uppsala, Sweden.
4 Department of Paediatric Perioperative Medicine and Intensive Care, Astrid Lindgren Children's Hospital, Karolinska University Hospital, Stockholm, Sweden; Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden.