1. Pathology and Physiology Research Branch; and Exposure Assessment Branch, HELD, NIOSH; Morgantown West Virginia
2. Department of Pathology; University of Pittsburgh Medical Center; Pittsburgh Pennsylvania
3. Department of Environmental and Occupational Health; University of Pittsburgh; Pittsburgh Pennsylvania
4. Office of Mine Safety and Health Research, NIOSH; Pittsburgh Pennsylvania
5. Department of Physiology and Pharmacology; West Virginia University; Morgantown West Virginia