J.J. Goedert, T.R. O'Brien, P.S. Rosenberg, C.S. Rabkin, E.A. Engels, M. Hisada, E. Maloney, M.H. Gail, S.J. O'Brien, M. Dean, M. Carrington, M. Smith, and C. Winkler, National Cancer Institute, Rockville, Maryland, and Frederick, Maryland; B. Konkle, Cardeza Foundation Hemophilia Center, Philadelphia, Pennsylvania; M. Manco-Johnson, Mountain States Regional Hemophilia and Thrombosis Program, University of Colorado, Aurora, Colorado; D. DiMichele and M.W. Hilgartner, Hemophilia Treatment Center, New York Presbyterian Hospital, New York, New York; P. Blatt, Christiana Hospital, Newark, Delaware; L.M. Aledort and S. Seremetes, Hemophilia Center, Mount Sinai Medical Center, New York, New York; K. Hoots, Gulf States Hemophilia Center, University of Texas at Houston, Houston, Texas; A.L. Angiolillo, N.L.C. Luban, Hemophilia Center, Children's Hospital National Medical Center, Washington, D.C.; A. Cohen and C.S. Manno, Hemophilia Center, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania; C. Leissinger, Tulane University Medical School, New Orleans, Louisiana; G.C. White II, Comprehensive Hemophilia Center, University of North Carolina, Chapel Hill, North Carolina; M.M. Lederman, S. Purvis, and J. Salkowitz, Case Western Reserve University School of Medicine, Cleveland, Ohio; C.M. Kessler, Georgetown University Medical Center, Washington, D.C.; A. Karafoulidou and T. Mandalaki, Hemophilia Center, Second Regional Blood Transfusion Center, Laikon General Hospital, Athens, Greece; A. Hatzakis and G. Touloumi, National Retrovirus Reference Center, Athens University Medical School, Athens, Greece; W. Schramm and F. Rommel, Medizinische Klinik Innerstadt der Maximilian, Universitaet Muenchen, Munich, Germany; P. de Moerloose, Haemostasis Unit, Hôpital Cantonal Universitaire, Geneva, Switzerland; S. Eichinger, University of Vienna Medical School, Vienna, Austria; K.E. Sherman, University of Cincinnati Medical Center, Cincinnati, Ohio; D. Whitby and D. Waters, Scientific Applications International Corp., Frederick, Maryland; and V. Lamprecht and B.L. Kroner, Research Triangle Institute, Rockville, Maryland.