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1Betula项目简介大型纵向区组研究─—BetulalongitudinalProspectivecohortresearchonmemory，healthandagins─—自1988年开始。该研究为期15年（198－200），耗资3500万克朗（约合人民币3814万元）。其主要目标是：①探讨成人健康和记忆的毕生发展规律；②探明痴呆症的临床
1Betula Project Profile Large Longitudinal Block Study - Betulalongitudinal Prospective Cohortresearch on Memory, Healthandagins ── Since 1988. The study for a period of 15 years (198-200), costing 35 million crowns (about 38.14 million yuan). Its main objectives are: ① to explore the law of adult life and the development of memory; ② clinical dementia