Mechanisms of hypoxaemia in severe pulmonary hypertension associated with COPD.

Competing Interests: Conflict of interest: L. Piccari reports grants and lecture honoraria from Janssen and Ferrer, participation on advisory boards with Janssen, Ferrer and United Therapeutics, and travel support from Janssen, Ferrer and MSD, outside the submitted work. I. Blanco reports lecture honoraria from Janssen, MSD and Ferrer, outside the submitted work. Y. Torralba reports lecture honoraria from TEVA, outside the submitted work. F. Burgos reports consulting fees for participation in a scientific advisory board for Medical Graphics Diagnostics, outside the submitted work. R. Rodríguez-Roisín reports grants from Chiesi Spain, outside the submitted work. J.A. Barberà reports consulting fees from Merck Sharp & Dome, Janssen-Cilag and Acceleron Pharma, lecture honoraria from Ferrer International, Janssen-Cilag and Merck Sharp & Dome, and travel support from Merck Sharp & Dome and Janssen-Cilag, outside the submitted work. All other authors have nothing to disclose.