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>> reporter: alzheimers disease only causes about half of all the cases of dementia. there are a number of treatable causes, including medication interaction, thyroid problems, vitamin deficiency and even depression. knowing whether you have alzheimers disease can really matter. dr. richard besser, abc news, new york. >> of course, all of this has been back in the news because of the feud within the reagan family. one of the things they say about alzheimers, really the level of support you have ...