1 Department of Psychiatry, PC Sint-Amandus, Beernem, Belgium.
2 Department of Biomedical Sciences, Laboratory of Neurochemistry and Behavior, Institute Born-Bunge, University of Antwerp, Antwerp, Belgium.
3 Department of Neurology and Alzheimer Research Center, University of Groningen and University Medical Center Groningen, Groningen, The Netherlands; and.
4 Department of Neurology and Memory Clinic, Middelheim General Hospital (ZNA), Antwerp, Belgium.