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A book about Alzheimer 's disease , Brain Longevity , written with Dharma Singh Khalsa , M.D. , proposed a multifaceted treatment program for the disease at a time when it was considered largely untreatable .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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