1. Department of Medicine A, Roswell Park Memorial Institute, Buffalo, New York.
2. Roswell Park Memorial Institute, Buffalo, N. Y.
3. Institut de Recherches Sur Les Leucémies, Hôpital Saint-Louis, Paris X, France.
4. Institut de Recherches Sur Les Leucémies, Hôpital, Saint-Louis, Paris X, France.
5. S.U.N.Y., Long Island Jewish Hospital, New Hyde Park, N. Y.
6. S.U.N.Y., Maimonides Hospital of Brooklyn, N. Y.
7. S.U.N.Y., Jewish Hospital of Brooklyn, Brooklyn, N. Y.
8. New York Hospital, Cornell Medical Center, New York.
9. Mt. Sinai Hospital, New York, N. Y.
10. Bowman Gray School of Medicine, Winston-Salem, N. C.
11. Walter Reed Army Medical Center, Cancer Chemotherapy Clinic, Washington, D. C.
12. Rhode Island Hospital, Providence, R. I.
13. Jefferson Medical College Hospital, Philadelphia, Pa.
14. Mayo Clinic, Rochester, Minn.
15. Montreal General Hospital, Montreal, P. Q., Canada.
16. Dartmouth Medical School Affiliated Hospital, Hitchcock Hospital, Hanover, N. H.
17. Medical College of Virginia, Richmond, Va.