1. From the Department of Neurology (M.Z., K.S., D.R., M.S.), Oslo University Hospital, Rikshospitalet, Norway
2. Institute of Clinical Medicine, University of Oslo, Norway (M.Z., K.S., H.S., D.R., M.S.).
3. Department of Pathology (H.S.), Oslo University Hospital, Rikshospitalet, Norway
4. Department of Cardiothoracic Surgery (B.L.), Oslo University Hospital, Rikshospitalet, Norway