1. BioMediTech Institute and Faculty of Biomedical Sciences and Engineering, Tampere University of Technology, Tampere, Finland;
2. Department of Clinical Neurophysiology, Seinäjoki Central Hospital, Seinäjoki, Finland;
3. Department of Anesthesiology, Tampere University Hospital, Tampere, Finland;
4. Department of Anesthesiology, Seinäjoki Central Hospital, Seinäjoki, Finland;
5. Department of Neuroscience and Biomedical Engineering, Aalto University, Espoo, Finland;
6. The Faculty of Medicine and Life Sciences, University of Tampere, Tampere, Finland;
7. Department of Anesthesiology, Oulu University Hospital, Oulu, Finland