[1] UCL, Inst Canc, London, England
[2] Anthony Nolan Res Inst, London, England
[3] UCL, Mental Hlth Sci Unit, London, England
[4] Univ London Imperial Coll Sci Technol & Med, Dept Med, London, England
[5] Univ Pittsburgh, Dept Gen Internal Med, Pittsburgh, PA USA
[6] VA Pittsburgh Healthcare Syst, Ctr Hlth Equity Res & Promot, Pittsburgh, PA USA
[7] Royal Marsden Hosp, Dept Haematol, London SW3 6JJ, England