Yunnan University, Yunnan University, Monash University - Department of Epidemiology and Preventive Medicine, Nanjing University, Yunnan University, University of Dundee, affiliation not provided to SSRN, Yunnan University, Yunnan University, Yunnan University, Yunnan University, affiliation not provided to SSRN, Yunnan University, Yunnan University, affiliation not provided to SSRN, Aarhus University and Yunnan University