1. Pulmonary Rehabilitation Unit, Morlaix Hospital Centre, European University of Occidental Brittany, EA3878, Morlaix, France
2. Pulmonary Physiology Unit, EA2438, European University of Occidental Brittany, University Brest Centre, Brest, France
3. Department of Internal Medicine and Chest Diseases, University Hospital of Brest, European University of Occidental Brittany, EA3878 (G.E.T.B.O), CIC INSERM 0502, Brest, France
4. Pulmonary and Reanimation Unit, Pitié salpétrière Hospital, Paris, France