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机构:
Peking Univ, Natl Sch Dev, Ctr Hlth Aging & Dev Studies, Beijing 100871, Peoples R China
Duke Univ, Ctr Study Aging & Human Dev, Med Sch, Durham, NC 27710 USA
Duke Univ, Div Geriatr, Med Sch, Durham, NC 27710 USA Sun Yat Sen Univ, Sch Sociol & Anthropol, Guangzhou 510275, Guangdong, Peoples R China