1Cardiology Department, Royal Free Hospital, London, UK
2Pulmonary and Critical Care, Massachusetts General Hospital, Harvard Medical School, Boston, USA
3University of Texas Southwestern, Dallas, USA
4Actelion Pharmaceuticals Ltd, Allschwil, Switzerland
5Department of Experimental, Diagnostic and Specialty Medicine (DIMES), Bologna University Hospital, Bologna, Italy
6University of Giessen and Marburg Lung Center, Giessen, Germany
7German Center of Lung Research (DZL), Giessen, Germany
8Department of Medicine, Imperial College London, London, UK
9Department of Respiratory Medicine, Hannover Medical School and German Centre for Lung Research, Hannover, Germany
10Division of Cardiology, Department of Internal Medicine II, Allgemeines Krankenhaus, Medical University of Vienna, Vienna, Austria
11Department of Internal Medicine, University of Michigan Health System, Ann Arbor, USA
12Department of Medicine, University of California, San Diego, USA
13Assistance Publique-Hôpitaux de Paris, Service de Pneumologie, Hôpital Bicêtre, Le Kremlin-Bicêtre, France
14Laboratoire d’Excellence en Recherche sur le Médicament et Innovation Thérapeutique, Université Paris-Sud, Le Kremlin-Bicêtre, France
15INSERM U-999, Centre chirurgical Marie Lannelongue, Le Plessis Robinson, France
16Cedars-Sinai Medical Center, Los Angeles, USA
17National Pulmonary Hypertension Unit, Mater Misericordiae University Hospital, Dublin, Ireland