1 Department of Anaesthesia and Intensive Care Medicine, Imperial College London, London, United Kingdom, francesca.rubulotta@nhs.net.
2 Department of Anaesthetics and Critical Care, Harefield Hospital, Royal Brompton and Harefield National Health System (NHS) Foundation Trust, London, United Kingdom.
3 Department of Anesthesia, Intensive Care Medicine, Chronic Pain and Emergency Medicine, Ludwigsburg Hospital, Ludwigsburg, Germany.
4 Department of Anesthesiology and Bioengineering, University of Utah, Salt Lake City, Utah.
5 Department of Neurosurgery, John Radcliffe Hospital, Oxford University Hospitals NHS Foundation Trust, Oxford, United Kingdom.
6 Department of Anesthesia, McGill University, Montreal, Quebec, Canada.