Hainan University, Hainan University, Hainan University, Hainan University, Hainan University, Hainan University, Hainan University, Hainan University, Hainan University, Hainan University, affiliation not provided to SSRN, affiliation not provided to SSRN, Uzbekistan Academy of Sciences - Institute of Polymer Chemistry and Physics, affiliation not provided to SSRN, Hainan Provincial Center for Disease Control and Prevention, Hainan University, Hainan Provincial Center for Disease Control and Prevention and Hainan University