[1] UCL, Inst Canc, London WC1E 6BT, England
[2] Natl Hlth Serv Blood & Transplant, Watford, Herts, England
[3] Univ Paris 11, INSERM, U770, Le Kremlin Bicetre, France
[4] Univ Paris 11, UMR, Le Kremlin Bicetre, France
[5] Royal Free Hosp, Katharine Dormandy Haemophilia Ctr, London NW3 2QG, England
[6] Royal Free Hosp, Thrombosis Unit, London NW3 2QG, England
[7] Kings Coll London, MRC, Ctr Transplantat, London WC2R 2LS, England
[8] UCL, Prenatal Cell & Gene Therapy Grp, London WC1E 6BT, England
[9] St Jude Childrens Res Hosp, Div Expt Hematol, Memphis, TN 38105 USA
[10] Childrens Hosp Philadelphia, Ctr Cellular & Mol Therapeut, Philadelphia, PA 19104 USA
[11] Childrens Hosp Philadelphia, Howard Hughes Med Inst, Philadelphia, PA 19104 USA
[12] St Jude Childrens Res Hosp, Dept Surg, Memphis, TN 38105 USA