Research & Innovation Unit, Althaia Xarxa Assistencial Universitària de Manresa, Carrer Dr. Joan Soler 1-3, 08242, Manresa, Spain. gemma.cuberas.borros@gmail.com. Department of Nuclear Medicine, Hospital Universitari Vall d'Hebrón, Universitat Autònoma de Barcelona, Barcelona, Spain. gemma.cuberas.borros@gmail.com. Department of Nuclear Medicine, Hospital Universitari Vall d'Hebrón, Universitat Autònoma de Barcelona, Barcelona, Spain. Alzheimer's Research Group, Grifols, Barcelona, Spain. Ace Alzheimer Center Barcelona - Universitat Internacional de Catalunya, Barcelona, Spain. Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas (CIBERNED), Instituto de Salud Carlos III, Madrid, Spain. Departments of Neurology and Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA. Radiology Department (IDI), Hospital Universitari Vall d'Hebron, Barcelona, Spain.