1. Addenbrooke’s Hospital, Cambridge, UK
2. School of Clinical Medicine, University of Cambridge, Cambridge, UK
3. Department of Transfusion, Addenbrooke’s Hospital, Cambridge, UK
4. Department of Cardiothoracic Anaesthesia and Critical Care Medicine, Papworth Hospital NHS Foundation Trust, Cambridge, UK
5. Division of Neurosurgery, Department of Clinical Neurosciences, Addenbrooke’s Hospital and University of Cambridge, Cambridge, UK