1. Colorado School of Public Health, Aurora, Colorado, USA
2. Department of Chemistry and Biochemistry, Scripps Institution of Oceanography, University of California, San Diego, San Diego, California, USA
3. American Public Health Association, Washington, D.C., USA
4. Department of Microbiology and Molecular Genetics, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
5. Department of Environmental, Agricultural and Occupational Health, University of Nebraska Medical Center, Omaha, Nebraska, USA
6. Division of Epidemiology, School of Public Health, University of California, Berkeley, Berkeley, California, USA
7. Department of Mechanical Engineering, Colorado State University, Fort Collins, Colorado, USA
8. Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA