1. St. Jude Children's Research Hospital, Memphis, Tennessee
2. Memorial Sloan-Kettering Cancer Center, New York, New York
3. University of Texas M. D. Anderson Cancer Center, Houston
4. University of Manitoba, Winnipeg
5. Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland
6. Princess Margaret Hospital, Toronto, Canada
7. Harvard Medical School, Boston, Massachusetts
8. Stanford University School of Medicine, Palo Alto
9. Kuzell Institute for Arthritis, San Francisco, California