1. Memory Clinic of Fundació ACE, Institut Català de Neurociències Aplicades, Barcelona, Spain
2. Nuclear Medicine Department, Hospital Universitari Vall d'Hebron, Barcelona, Spain
3. Hospital Universitari Vall d'Hebron-Institut de Recerca, Universitat Autònoma de Barcelona (VHIR-UAB), Barcelona, Spain
4. Psychiatry Department, Hospital Universitari Vall d'Hebron, CIBERSAM, Universitat Autònoma de Barcelona, Barcelona, Spain
5. Department of Neurology, University of Pittsburgh, Pittsburgh, PA, USA
6. Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, USA
7. Department of Psychology, University of Pittsburgh, Pittsburgh, PA, USA