1. Western States Office, Centers for Disease Control and Prevention; National Institute for Occupational Safety and Health; Denver, Colorado
2. Division of Safety Research, Centers for Disease Control and Prevention; National Institute for Occupational Safety and Health; Morgantown, West Virginia
3. Division of Surveillance, Hazard Evaluations, and Field Studies, Centers for Disease Control and Prevention; National Institute for Occupational Safety and Health; Cincinnati, Ohio
4. Rocky Mountain Center for Occupational and Environmental Medicine; University of Utah; Salt Lake City, Utah