1. Department of Psychiatry , Turku University Hospital , Turku , Finland
2. Department of Oral Diseases , Turku University Hospital , Turku , Finland
3. Department of Anesthesiology, Intensive Care, Emergency Care and Pain Medicine , Turku University Hospital , Turku , Finland
4. Department of Neurology , Turku University Hospital , Turku , Finland
5. Department of Physiology, Institute of Biomedicine , University of Helsinki , Helsinki , Finland
6. Department of Clinical Neurophysiology , Turku University Hospital , Turku , Finland