1. Division of Neurocritical Care, Department of Neurology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
2. Division of Anaesthesia, Department of Medicine, University of Cambridge, Cambridge, United Kingdom
3. School of Psychology and Centre for Human Brain Health, University of Birmingham, Birmingham, United Kingdom
4. Division of Neurocritical Care, Department of Neurology, Brigham and Women's Hospital, Boston, Massachusetts