1. Respiratory Health Division; Centers for Disease Control and Prevention (CDC); National Institute for Occupational Safety and Health (NIOSH); Morgantown West Virginia
2. Health Effects Laboratory Division; National Institute for Occupational Safety and Health (NIOSH), CDC; Morgantown West Virginia
3. Division of Surveillance, Hazard Evaluations, and Field Studies; National Institute for Occupational Safety and Health (NIOSH), CDC; Cincinnati Ohio
4. Division of Pulmonary and Critical Care Medicine; Duke University Medical Center; Durham North Carolina