1. Section of Clinical Neurophysiology, Department of Neurology; Oslo University Hospital - Rikshospitalet; Norway
2. Astra-Zeneca R&D; Södertälje Sweden
3. Department of Clinical Neuroscience; Karolinska Institutet; Solna Sweden
4. Department of Anesthesiology Mannheim; Heidelberg University; Germany
5. Faculty of Medicine, Institute of Clinical Medicine; University of Oslo; Norway