1. 3M Company, Medical Department, St. Paul,
Minnesota, United States
2. 3M Company, Environmental Laboratory,
St. Paul, Minnesota, United States
3. American Red Cross, North Central Region,
St. Paul, Minnesota, United States
4. Division of Environmental Health
Sciences, University of Minnesota, Minneapolis,
Minnesota, United States
5. American Red Cross, Carolinas Region,
Charlotte, North Carolina, United States
6. American Red Cross, Southern
California Region, Los Angeles, California, United States
7. American Red Cross, Pacific Northwest Region, Portland, Oregon, United States
8. American Red Cross, Greater Alleghenies Region, Johnstown, Pennsylvania, United States
9. American Red Cross, New England Region, Dedham, Massachusetts, United States