A. J. Aho 1,2*, L.-P. Lyytikäinen 3, A. Yli-Hankala 1,2, K. Kamata 1 and V. Jäntti 3,4,5 1 Department of Anaesthesia, Tampere University Hospital, PO Box 2000, 33521 Tampere, Finland 2 University of Tampere, Medical School, Tampere, Finland 3 Department of Clinical Neurophysiology, Medical Imaging Centre, Pirkanmaa Hospital District, Tampere, Finland 4 Department of Clinical Neurophysiology, Se...