1. From the Respiratory Institute, Hospital Clinic, Institut d’Investigació Agustí Pi i Sunyer, and the University of Barcelona, Barcelona; and Centro de Investigación Biomédica en Red de Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid (A.A.); and the Center for Heart and Lung Innovation, University of British Columbia at St. Paul’s Hospital, Vancouver, Canada (J.C.H.).