The researchers also assessed both groups with questionnaires designed to determine physical and behavioral dependence on cigarettes.

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It has designed 20 detailed questionnaires it circulates regularly to its members.

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The questionnaires are designed to identify several mental-health conditions.

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According to a press release, the study failed to meet its pre-stated goal of helping patients do better on any of several questionnaires and tests designed to measure Alzheimer's severity.

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