1. From the Department of Physiology (T.R.J.L., D.H.J.T.), Radboud University Medical Centre, Radboud Institute for Health Sciences, Nijmegen, Gelderland, the Netherlands
2. Department of Geriatric Medicine (Y.S.), Radboud University Medical Centre, Radboud Institute for Health Sciences, Nijmegen, Gelderland, the Netherlands
3. Department of Surgery, Radboud University Medical Centre, Nijmegen, Gelderland, the Netherlands (M.C.W.)
4. Department of Neurology, Radboud University Medical Centre, Donders Institute for Brain, Cognition and Behaviour, Centre for Cognitive Neuroscience, Nijmegen, Gelderland, the Netherlands (F.-E.d.L.).