Longitudinal associations between pain and cognitive decline in middle-aged and older Chinese adults: the mediating role of depressive symptoms - Cheng, Xia; Zhang, Kun; Liu, Jiayang; Hu, Jiaxin; Yuan, Qingxiu; Cai, Hang; Hu, Hongxia; Liao, Danfeng; Lin, Lin (Frontiers in Public Health, 2025)