1. The International Bone Marrow Transplant Registry, Health Policy Institute, Medical College of Wisconsin, Milwaukee, Wisconsin, U.S.A.
2. Department of Hematology, University of Texas, M. D. Anderson Cancer Center, Houston, Texas, U.S.A.
3. Salick Health Care Inc., Los Angeles, California, U.S.A.
4. Division of Transplantation Medicine, University of South Carolina, Columbia, South Carolina, U.S.A.
5. Service d'Hématologie, Bone Marrow Transplant Unit, Hôpital Jean Minjoz, Besancon, France
6. Division of Haematology/Oncology, Hospital for Sick Children, Toronto, Ontario, Canada
7. Departement Innere Medizin, Abteilung Hämatologie, Kantonsspital Basel, Basel, Switzerland
8. Service d'ématologie, Hôpital Saint Louis, Paris, France
9. Bone Marrow Transplant Programme, Instituto Portugues de Oncologia, Lisbon, Portugal