1. Health Effects Laboratory Division, CDC/NIOSH, Morgantown, WV, USA;
2. Department of Human Genetics, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA;
3. BRT-Burleson Research Technologies, Morrisville, NC, USA;
4. University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, OH, USA;
5. Department of Pediatrics, School of Medicine, University of Nevada, Reno, NV, USA;
6. Department of Dermatology, School of Medicine, West Virginia University, Morgantown, WV, USA;
7. Office of Director, CDC/NIOSH, Morgantown, WV, USA;
8. Toxicology Branch, DNTP/NIEHS, Research Triangle Park, NC, USA;
9. School of Public Health, West Virginia University, Morgantown, WV, USA