1 From the Department of Paediatric Anaesthesia, Istituto Giannina Gaslini, Genoa, Italy (ND), Department of Anaesthesia, Great Ormond Street Hospital, London, UK (MT), Department of Paediatric & Obstetric Anaesthesia, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark (AA), Département d'Anesthésie, Réanimation pédiatrique Hôpital Jeanne de Flandre, CHU de Lille, Lille, France (FV) and Department of Anaesthesiology & Perioperative Medicine, Ghent University Hospital, Ghent University, Ghent, Belgium (SDH).