Scheinin NM, Wikman K, Jula A, Perola M, Vahlberg T, Rokka J, Någren K, Viitanen M, Rinne JO. Cortical ¹¹C-PIB uptake is associated with age, APOE genotype, and gender in \"healthy aging\". J Alzheimers Dis. 2014;41(1):193–202. doi: 10.3233/jad-132783. PMID: 24603945.