1. Department of Anaesthesiology, University Hospital of Würzburg, Würzburg, Germany
2. Wolfson Centre for Age-Related Diseases, Institute of Psychiatry, Psychology & Neuroscience, King’s College London, London, UK
3. Department of Anaesthesiology, University Hospital of Frankfurt, Frankfurt, Germany
4. Department of Anaesthesiology, University Hospital of Cologne, Cologne, Germany