1. Department of Family and Preventive Medicine, Rocky Mountain Center for Occupational and Environment Health, School of Medicine; University of Utah; Salt Lake City Utah
2. Center for Truck and Bus Safety; Virginia Tech Transportation Institute; Blacksburg Virginia
3. Arkansas Occupational Health Clinic; Springdale Arkansas
4. Department of Environmental Health; School of Public Health; Harvard University; Cambridge Massachusetts
5. Department of Civil and Environmental Engineering, Utah Traffic Lab; University of Utah; Salt Lake City Utah
6. Occumedix, Inc.; Dresher Pennsylvania