1. a 3M Occupational Health and Environmental Safety Division, 3M Center Bldg. 260-3B-09, St. Paul, MN 55144
2. b West Virginia University, P.O. Box 6101, Morgantown, WV 26505-6101
3. c Moldex Metric, Inc., 4671 Leahy Street, Culver City, CA 90230
4. d Arthur D. Little of Canada, Limited, 67 Yonge Street, Ste. 200, Toronto, Ontario, Canada M5E 1J8