[1] Royal Brompton Hosp, Dept Radiol, London, England
[2] Univ Leeds, Med Sch, Leeds, W Yorkshire, England
[3] St Georges Univ London, London, England
[4] Royal Brompton Hosp, Anaesthesia & Crit Care, London, England
[5] Royal Brompton Hosp, Natl Pulm Hypertens Serv, London, England
[6] Imperial Coll London, Dept Haematol, London, England
[7] Royal Brompton Hosp, Dept Haematol, London, England
[8] Imperial Coll Healthcare NHS Trust, Dept Haematol, 4th Floor,Commonwealth Bldg,Du Cane Rd, London W12 0NN, England