College of Earth and Environmental Sciences;
Lanzhou University;
Lanzhou 730000;
China;
Department of Epidemiology and Statistics;
School of Public Health;
Lanzhou University;
Lanzhou 730000;
China;
School of Public Health and Emergency Management;
Southern University of Science and Technology;
Shenzhen 518055;
China;
Bayesian kernel machine regression; Cobalt; Diabetes; Insulin resistance; Molybdenum;