Prevalence and risk factors of long COVID-19 persisting for 2 years in Hainan Province: a population-based prospective study nork Daya Zhang, Chen Chen, Yunqian Xie, Shuo Zhou, Da Li, Fan Zeng, Shimei Huang, Yanting Lv, Xianfeng Huang, Fengjiao Mao, Jinglei Kuang, Jin Gan, Xiaojing Xu, Shiju Chen, Runxiang Chen, Xiaodong Zhang, Sangni Xu, Minyu Zeng, Haoyue Ren, Feihu Bai

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