[1] Royal Free London NHS Fdn Trust, Barnet Hosp, Dept Gen Med, London, England
[2] Royal Free London NHS Fdn Trust, Barnet Hosp, Dept Clin Haematol, London, England
[3] Royal Free London NHS Fdn Trust, Barnet Hosp, Dept Rheumatol & Gen Med, London, England
[4] UCL, Div Med, London, England