1. National Institute for Occupational Safety and Health, Cincinnati, Ohio, USA
2. Procter & Gamble, Cincinnati, Ohio, USA
3. Department of Preventive Medicine and Public Health and Department of Obstetrics Gynecology, University of Kansas, Wichita, Kansas, USA
4. Occupational Health Program, University of Maryland School of Medicine, Baltimore, Maryland, USA
5. National Institute for Occupational Safety and Health, Morgantown, West Virginia, USA
6. National Health and Environmental Effects Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, USA
7. Center for Occupational and Environmental Health, University of California at Los Angeles, Los Angeles, California, USA
8. Department of Defense Center for Deployment Health Research, San Diego, California, USA
9. National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, North Carolina, USA