1. Department of Anaesthesia; Division of Clinical Neurosciences; University of Nottingham, Nottingham UK
2. Applied Optics Group, Faculty of Engineering; University of Nottingham; Nottingham UK
3. School of Veterinary Medicine and Science; University of Nottingham; Sutton Bonington Campus Leicestershire UK
4. Department of Anaesthetics; Nottingham University Hospitals NHS Trust; Nottingham UK