[1] Royal Brompton Hosp, Dept Cardiol, London SW3 6NP, England
[2] Int Registry Pathol, CVPath, Gaithersburg, MD USA
[3] Royal Brompton Hosp, Dept Histopathol, London SW3 6NP, England
[4] Imperial Coll Sch Med, Natl Heart & Lung Inst, London SW3 6LY, England