[1] Hop Bicetre, Pneumol, Le Kremlin Bicetre, France
[2] Univ Michigan Hosp, Ann Arbor, MI 48109 USA
[3] Imperial Coll London, London, England
[4] George Washington Univ, Sch Med & Hlth Sci, Washington, DC 20037 USA
[5] Hannover Med Sch, Dept Resp Med, Hannover, Germany
[6] Tufts Med Ctr, Div Pulm Crit Care & Sleep Med, Boston, MA 02111 USA
[7] Univ Sao Paulo, Pulm Div Heart Inst, Med Sch, Sao Paulo, Brazil
[8] Brigham & Womans Hosp, Div Pulm & Crit Care Med, Boston, MA USA
[9] Univ Hosp Giessen & Marburgh GmbH, Giessen, Germany
[10] Hosp Univ 12 Octubre, Madrid, Spain
[11] Arizona Pulm Specialists, Phoenix, AZ USA
[12] Ctr Hipertensao Pulmonar, Porto Alegre, RS, Brazil
[13] Acceleron Pharma Inc, Cambridge, MA USA
[14] Univ Colorado, Aurora, CO USA