1. Section of Anesthesiology and Intensive Care, Department of Physiology and Pharmacology, Stockholm, Sweden.
2. Section of Neuroradiology, Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden.
3. Division of Cell and Molecular Biology, Immunogenomics Group, Imperial College London, London, England.
4. Section of Neurosurgery, Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden.