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机构:
Peking Univ, Natl Sch Dev, China Ctr Econ Res, Beijing, Peoples R China
Duke Univ, Ctr Study Aging & Human Dev, Durham, NC USA
Duke Univ, Med Ctr, Div Geriatr, Durham, NC USA
Duke Univ, Dept Sociol, Durham, NC 27706 USA
Max Planck Inst Demog Res, Rostock, Germany Peking Univ, Natl Sch Dev, China Ctr Econ Res, Beijing, Peoples R China