MAPT and Alzheimer disease: The difficulties in separating ‘age-related’ from AD-related processes are illustrated by Table 1 from Crary et al. [8] in which cases with Aβ deposition in the cortex (phase 1) or in the hippocampus (phase 2)––i.e., cases with tau/Aβ I/1 or III/2—are classified as Pure Age Related Tauopathy (PART), a contradiction in terms.