1. Division of Neurosurgery, Department of Clinical Neurosciences, Addenbrooke's Hospital, University of Cambridge, Cambridge, UK
2. Institute of Electronic Systems, Warsaw University of Technology, Warsaw, Poland
3. Institute of Biomedical Engineering and Instrumentation, Wroclaw University of Technology, Warsaw, Poland
4. Department of Anesthesiology, Texas Children's Hospital, Baylor College of Medicine, Houston, Texas, USA