Reduced functional independence and multimorbidity increases the risk of severe infection among older patients with Omicron: a multicenter retrospective cohort study by Wan Yu, Runnian Huang, Shuning Sun, Li Bu, Xin Chen, Yunhua Di, Shuwu Lin, Qian Li, Yang Yang, Xingyue Ye, Wenxu Wang, Rui Ren, Linze Xi, Ru Zhang, Yi Li, Xin Li, Tianbo Hou, Zibo Ning, Yang Peng, Difei Wang

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