1. Respiratory Health Division, National Institute for Occupational Safety and Health (NIOSH) Centers for Disease Control and Prevention (CDC) Morgantown West Virginia USA
2. Western States Division NIOSH, CDC Denver Colorado USA
3. Rocky Mountain Center for Occupational and Environmental Health University of Utah School of Medicine Salt Lake City Utah USA
4. Division of Field Studies & Engineering NIOSH, CDC Cincinnati Ohio USA
5. Amalgamated Transit Union Silver Spring Maryland USA
6. Emergency Preparedness and Response Office NIOSH, CDC Atlanta Georgia USA