1. Office of Occupational Medicine and Nursing, Directorate of Technical Support and Emergency Management, Occupational Safety and Health Administration U.S. Department of Labor Washington District of Columbia USA
2. Austin Area Office, Occupational Safety and Health Administration U.S. Department of Labor Austin Texas USA
3. Salt Lake Technical Center, Directorate of Technical Support and Emergency Management, Occupational Safety and Health Administration U.S. Department of Labor Salt Lake City Utah USA
4. National Medical Surveillance Services Concentra Waco Texas USA