Juuso Isotalo1, Tero Vahlberg2, Valtteri Kaasinen1,3,4. 1. Division of Clinical Neurosciences, Turku University Hospital, Turku, Finland. 2. Department of Biostatistics, University of Turku, Turku, Finland. 3. Department of Neurology, University of Turku, Turku, Finland. 4. Turku PET Centre, Turku, Finland.