1. Environmental Public Health Division, National Health and Environmental Effects Research Laboratory, and
2. National Exposure Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, USA
3. Environmental Sciences Division, National Exposure Research Laboratory, U.S. Environmental Protection Agency, NASA Langley Research Center, Hampton, Virginia, USA
4. Department of Emergency Medicine, School of Medicine, University of North Carolina, Chapel Hill, North Carolina, USA
5. Pitt County Memorial Hospital, Greenville, North Carolina, USA
6. Brody School of Medicine at East Carolina University, Department of Cardiovascular Sciences and the East Carolina Heart Institute, Greenville, North Carolina, USA
7. North Carolina Division of Public Health, North Carolina Department of Health and Human Services, Raleigh, North Carolina, USA