1 National Reference Centre for Rare Pulmonary Diseases, Louis Pradel Hospital, Hospices Civils de Lyon, ERN-LUNG, UMR 754, Claude Bernard University Lyon 1, Lyon, France vincent.cottin@chu-lyon.fr.
2 Hospital Universitario de la Princesa, Universidad Autonoma de Madrid, Madrid, Spain.
3 National Reference Center for Pulmonary Hypertension, Bicêtre Hospital (AP-HP), ERN-LUNG, Inserm 999, University Paris Saclay, Le Kremlin-Bicêtre, France.