[1] Guys & St Thomas NHS Fdn Trust, Royal Brompton & Harefield Hosp, Natl Pulm Hypertens Serv, London, England
[2] Imperial Coll London, Natl Heart & Lung Inst, London, England
[3] Guys & St Thomas NHS Fdn Trust, Royal Brompton & Harefield Hosp, Dept Interstitial Lung Dis, London, England
[4] Inova Fairfax Hosp, Falls Church, VA USA
[5] Royal Brompton Hosp, Adult Congenital Heart Dis Serv, London, England
[6] Temple Univ Hosp & Med Sch, Philadelphia, PA USA
[7] Guys & St Thomas NHS Fdn Trust, Royal Brompton & Harefield Hosp, Dept Radiol, London, England
[8] Royal Brompton Hosp, Sydney St, London SW3 6NP, England