Predictive role of depressive symptoms on frailty and its components in Chinese middle-aged and older adults: a longitudinal analysis by Yuanhao Sun, Xiangdong Li, Haiyang Liu, Yuqing Li, Jiaofeng Gui, Xiaoyun Zhang, Xiaoping Li, Lu Sun, Congzhi Wang, Jing Li, Mingming Liu, Dongmei Zhang, Jingyi Gao, Xuefeng Kang, Yunxiao Lei, Lin Zhang, Ting Yuan

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