1. Biostatistics and Computational Biology Branch National Institute of Environmental Health Sciences Research Triangle Park NC USA
2. Center for Public Health and Environmental Assessment US Environmental Protection Agency Washington DC USA
3. Department of Environmental and Occupational Health School of Public Health, Indiana University Bloomington IN USA
4. Bruce C Allen Consulting Chapel Hill NC USA
5. General Dynamics Information Technology Federal Civilian Division EPA (N127‐01) RTP NC USA
6. National Center for Environmental Assessment U.S. Environmental Protection Agency Cincinnati OH USA
7. US Environmental Protection Agency (B243‐01) National Center for Environmental Assessment RTP NC USA