1. Research Institute for Environment and Health, School of Law and Public Affairs, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China
2. Department of Statistics, University of South Carolina, Columbia, South Carolina, USA
3. South Carolina SmartState Center for Healthcare Quality (CHQ), University of South Carolina Arnold School of Public Health, Columbia, South Carolina, USA
4. Center for Global Health, Nanjing Medical University, Nanjing, Jiangsu, China