1. Department of Experimental, Diagnostic and Specialty Medicine-DIMES, via Massarenti 9, Bologna 40138, Italy
2. Clinical Department of Cardiology and Angiology, 1st Faculty of Medicine, 2nd Medical Department, Charles University, Prague, Czech Republic
3. Cardiopulmonary Department, Ignacio Chávez, National Heart Institute, Mexico City, Mexico
4. Pulmonary and Critical Care, Massachusetts General Hospital, Boston, MA, USA
5. Department of Pneumology, Gasthuisberg University Hospital, Leuven, Belgium
6. University of Giessen and Marburg Lung Center (UGMLC), Giessen, Germany, Member of the German Center of Lung Research (DZL), and Department of Medicine, Imperial College London, London, UK
7. Actelion Pharmaceuticals Ltd, Allschwil, Switzerland
8. Division of Respirology, Department of Medicine, London Health Sciences Centre, Victoria Hospital, Western University, London, ON, Canada
9. Division of Pulmonary and Critical Care Medicine, University of California, San Diego Medical School, San Diego, CA, USA
10. Department of Cardiology, CARE Hospitals, Hyderabad, India
11. Assistance Publique-Hôpitaux de Paris, Service de Pneumologie, Hôpital Bicêtre, Université Paris-Sud, Laboratoire d'Excellence en Recherche sur le Médicament et Innovation Thérapeutique, and INSERM U-999, Le Kremlin-Bicêtre, France
12. Pulmonary Department, Heart Institute, University of São Paulo Medical School, São Paulo, Brazil
13. Department of Pulmonary Circulation and Thromboembolic Diseases, Medical Center for Postgraduate Education, ECZ-Otwock, Poland