1. Anaesthesia Section Centre for Elective Surgery Silkeborg HospitalHE Midt Viborg Denmark
2. Department of Clinical Medicine Aarhus University Aarhus N Denmark
3. Department of Psychiatry and Neurochemistry Institute of Neuroscience and Physiology Sahlgrenska Academy at the University of Gothenburg Mölndal Sweden
4. Clinical Neurochemistry Laboratory Sahlgrenska University Hospital Mölndal Sweden
5. Department of Anaesthesia RigshospitaletCopenhagen University Hospital Denmark
6. Department of Neurodegenerative Disease UCL Institute of NeurologyQueen Square London UK
7. UK Dementia Research Institute at UCL London UK