From the Technologies for Respiration Laboratory, Electronics, Information and Bioengineering Department (DEIB), Politecnico di Milano, Milan (EZ, SV, RD), Neonatal Intensive Care Unit, Fondazione IRCCS San Gerardo dei Tintori, Monza, Italy (EZ), Department of Anaesthesia and Pain Medicine, Perth Children's Hospital (JN, NH, DS, AS, BSvU-S), Perioperative Team, Perioperative Care Program, Telethon Kids Institute (JN, NH, DS, RNK, AS, BSvU-S), Institute for Paediatric Perioperative Excellence (NH, DS, RNK, AS, BSvU-S), Division of Emergency Medicine, Anaesthesia and Pain Medicine, Medical School (NH, DS, AS, BSvU-S) and Department of Mathematics and Statistics, The University of Western Australia, Perth, Western Australia, Australia (RNK)

Correspondence to Britta S. von Ungern-Sternberg, Department of Anaesthesia and Pain Medicine, Perth Children's Hospital, Perth, WA, Australia. E-mail: [email protected]