[1] Royal Brompton Hosp, Adult Congenital Heart Ctr, London SW3 6LY, England
[2] Royal Brompton Hosp, Ctr Pulm Hypertens, London SW3 6LY, England
[3] Univ London Imperial Coll Sci Technol & Med, Dept Expt Med & Toxicol, London, England
[4] Univ London Imperial Coll Sci Technol & Med, Natl Heart & Lung Inst, London, England
[5] Univ Wurzburg, Med Klin 1, Wurzburg, Germany
[6] Hammersmith Hosp, Natl Pulm Hypertens Serv, London, England
[7] UCL, Wolfson Inst Biomed Res, London, England