They made their discovery, just reported in the Journal of Proteome Research, by tapping into a long-term, continuing study that started in 1995 with 1, 077 non-demented and otherwise healthy people aged between 60 and 90.

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Officers are continuing to study CCTV footage and carry out door-to-door inquiries.

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Researchers also are continuing to study newer treatments, including other antidepressants and a progesterone-based medication, he said.

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