1 From the Department of Surgical Sciences, Section of Anaesthesiology and Intensive Care Medicine, Uppsala University, Uppsala, Sweden (PF), Unit for Research & Innovation, Department of Paediatric Anaesthesia, Istituto Giannina Gaslini, Genova, Italy (ND), Department of Anaesthesia, Critical Care, Emergency medicine and Pain Medicine, University Hospitals of Wuerzburg, Germany (PK) and Department of Pediatric and Obstetric Anaesthesia, University of Copenhagen, Rigshospitalet, Denmark (AA).