By following 597 Alzheimer’s patients over 15 years, researchers have determined that a simple progression rate can be calculated at the initial visit, using symptom onset and present performance, and that this can reliably identify slow, intermediate and rapid progression.
Reference:
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Alzheimer's Research & Therapy. 2(1), 2 - 2.
Full text available at http://alzres.com/content/2/1/2/