1. Field Studies Branch, Division of Respiratory Disease Studies, National Institute for Occupational Safety and Health; Centers for Disease Control and Prevention; Morgantown West Virginia
2. Epidemic Intelligence Service; Centers for Disease Control and Prevention; Atlanta Georgia
3. Hazard Evaluations and Technical Assistance Branch, Division of Surveillance, Hazard Evaluations, and Field Studies, National Institute for Occupational Safety and Health; Centers for Disease Control and Prevention; Cincinnati Ohio
4. Tobacco and Volatiles Branch, Division of Laboratory Sciences National Center for Environmental Health; Centers for Disease Control and Prevention; Atlanta Georgia