1. a Department of Defense, United States Navy, Occupational Health Technical Division, Mare Island Naval Shipyard, Vallejo, CA 94592
2. b Department of Environmental Health, University of Cincinnati, Cincinnati, OH 45267
3. c National Council of the Paper Industry for Air and Stream Improvement, Inc., West Coast Regional Center, Corvallis, OR 97339
4. d Division of Surveillance, Hazard Evaluation and Field Studies, National Institute for Occupational Safety and Health, Cincinnati, OH 45226
5. e Metropolitan Sewer District of Greater Cincinnati, Cincinnati, OH 45204