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我们于1978年以来对上海市区100岁以上老人16名进行了家访及随访,又于1981年第一季度对卢湾区瑞金街道90岁以上老人44名进行了家访,前后共调查了60名。调查方
Since 1978, we conducted home visits and 16 follow-up visits to 16 elderly people over the age of 100 in Shanghai. In the first quarter of 1981, we visited 44 elderly people over the age of 90 in Ruijin Street, Luwan District. We surveyed 60 of them. Investigator