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Effects of physical activity levels on frailty of older Chinese people:a multi-period data study based on the China health and retirement longitudinal study
WANG Shiqiang, GUO Kailin, LI Dan, WANG Yijie, WANG Shaokun, XU Zhihan, LYU Wangang
Journal of Shaanxi Normal University(Natural Science Edition) . 2023, (5): 91 -103 .  DOI: 10.15983/j.cnki.jsnu.2023302

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