1 From the Department of Anaesthesiology and Intensive Care, Akershus University Hospital, Lørenskog, Norway (TGH), the Faculty of Medicine, Institute of Clinical Medicine, Oslo University, Oslo, Norway (TGH), the Department of Neonatology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark (LA), the Department of Clinical Medicine, Copenhagen University, Copenhagen, Denmark (LA), the Department of Anaesthesia, University Children's Hospital, Zurich, Switzerland (MW).