1. Virginia Commonwealth University, Richmond, Virginia.
2. Boston University, Boston, Massachusetts.
3. Fred Hutchinson Cancer Research Center, Seattle, Washington.
4. Howard University Cancer Center, Washington, DC.
5. Arizona Cancer Center, University of Arizona, Tucson, Arizona.
6. Washington Hospital Center, Washington, DC.
7. University of Massachusetts Medical School, Worcester, Massachusetts.
8. University of Iowa, Iowa City, Iowa.
9. University of Virginia, Charlottesville, Virginia.