To examine the longitudinal course of primary progressive aphasia (PPA) over a 2-year period and to offer quantitative ranges of expected change that could be used to guide the design and evaluation of therapeutic intervention trials.
Northwestern University, Cognitive Neurology and Alzheimer's Disease Center (CNADC), 320 E Superior Street, Searle Building 11th Floor, Chicago, IL 60611, USA. erogalski@gmail.com
