Changes in patterns of multimorbidity and associated with medical costs among Chinese middle-aged and older adults from 2013 to 2023: an analysis of repeated cross-sectional survey... by Changyu Ju, Hongjia Liu, Yongxiang Gong, Meng Guo, Yingying Ge, Yuheng Liu, Rui Luo, Meng Yang, Xiuying Li, Yangwenhao Liu, Xiangbin Li, Tiemei He, Xiaodong Liu, Chunrong Huang, Yihua Xu, Juming Liu

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