Alexopoulos, Panagiotis ; Thierjung, Nathalie ; Grimmer, Timo ; Ortner, Marion ; Economou, Polychronis ; Assimakopoulos, Konstantinos ; Gourzis, Philippos ; Politis, Antonios ; Perneczky, Robert [P:(DE-2719)2812234] ; Initiative, The Alzheimer’s Disease Neuroimaging