1. National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
2. Department of Mathematics and Computer Science, Duquesne University, Pittsburgh, Pennsylvania, USA
3. Battelle Memorial Institute, Columbus, Ohio, USA
4. National Exposure Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, USA
5. National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Cincinnati, Ohio, USA
6. RTI International, Research Triangle Park, North Carolina, USA
7. Texas A&M University System Health Science Center, College Station, Texas, USA
8. School of Human Environmental Sciences, University of Pennsylvania, Philadelphia, Pennsylvania, USA
9. Rollins School of Public Health, Emory University, Atlanta, Georgia, USA