Lanzhou University - Evidence-Based Social Science Research Center, Lanzhou University, Lanzhou University, Lanzhou University, Lanzhou University, Lanzhou University, Laiyang Center for Disease Control and Prevention, Lanzhou Institute of Biological Products Co Ltd, Lanzhou University - School of Public Health, Lanzhou University - Evidence-Based Social Science Research Center, Lanzhou University - Evidence-Based Social Science Research Center, University of Iowa, Lanzhou University and University of Ottawa - Centre for Global Health Bruyère Research Institute