1. Departments of Neurological Surgery, Internal Medicine, General Surgery, and Neuroscience Karolinska Institutet Huddinge Stockholm Sweden
2. Departments of Neurological Surgery, Neurophysiology, Neuroscience University of Oslo Oslo Norway
3. Departments of Neurological Surgery and Neurochemistry University of Helsinki Helsinki Finland
4. Departments of Neurological Surgery, Internal Medicine, Cardiothoracic Surgery, and Neuroscience University of California Francisco San Francisco CA USA
5. Departments of Neurological Surgery and Neuroscience Barrow Neurological Institute Phoenix AZ USA