[1] Imperial Coll, Natl Heart & Lung Inst, London, England
[2] Univ Utah, Salt Lake City, UT USA
[3] New Orleans Scleroderma & Sarcoidosis Patientt Ca, New Oleans, LA USA
[4] Tulane Univ, Lung Ctr, New Oleans, LA USA
[5] Royal Brompton & Harefield NHS Fdn Trust, London, England
[6] Tulane Univ, New Orleans, LA 70118 USA
[7] Tulane Univ, Sch Med, 1430 Tulane Ave, New Orleans, LA 70112 USA