1. Department of Biological Sciences, and
2. Center for Human Health and the Environment, North Carolina State University, Raleigh, North Carolina, USA
3. Biostatistics and Computational Biology Branch, National Institute of Environmental Health Sciences (NIEHS), National Institutes of Health (NIH), Department of Health and Human Services (DHHS), Research Triangle Park, North Carolina, USA
4. Westat, Durham, North Carolina, USA
5. Epidemiology Branch, NIEHS, NIH, DHHS, Research Triangle Park, North Carolina, USA
6. Division of Respiratory Disease Studies, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, West Virginia, USA
7. National Cancer Institute, NIH, DHHS, Rockville, Maryland, USA