1. Program in Public Health, University of California, Irvine, Irvine, California, USA
2. Department of Civil and Environmental Engineering, University of California, Davis, Davis, California, USA
3. School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China
4. Department of Statistics, University of California, Irvine, Irvine, California, USA
5. Keck School of Medicine, University of Southern California, Los Angeles, California, USA