title: [Introduction. COPD].
authors.affiliation: Servicio de Neumología, Hospital Clínico San Carlos, Universidad Complutense, Madrid. jlalvarezsala@gmail.com
authors.forename: José Luis
authors.initials: JL
authors.lastname: Alvarez-Sala
authors.forename: Javier de Miguel
authors.initials: Jde M
authors.lastname: Díez
mesh_terms: D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive