1 Institute of Occupational Health and Environmental Health, School of Public Health, Lanzhou University, Lanzhou, Gansu, 730000, PR China.
2 Hong Kong Institute of Diabetes and Obesity, The Chinese University of Hong Kong, PR China.
3 Institute of Occupational Health and Environmental Health, School of Public Health, Lanzhou University, Lanzhou, Gansu, 730000, PR China; Shanghai Key Laboratory of Meteorology and Health, Shanghai, 200030, PR China. Electronic address: luob@lzu.edu.cn.