title: Response.
authors.affiliation: Pulmonary Section, San Pedro de Alcántara Hospital, Cáceres, Spain; CIBER de enfermedades respiratorias (CIBERES), Madrid, Spain. Electronic address: fmasa@separ.es.
authors.forename: Juan F
authors.initials: JF
authors.lastname: Masa
authors.affiliation: Pulmonary Section, San Pedro de Alcántara Hospital, Cáceres, Spain; CIBER de enfermedades respiratorias (CIBERES), Madrid, Spain.
authors.forename: Jaime
authors.initials: J
authors.lastname: Corral
authors.affiliation: Pulmonary Section, San Pedro de Alcántara Hospital, Cáceres, Spain; CIBER de enfermedades respiratorias (CIBERES), Madrid, Spain.
authors.forename: Javier
authors.initials: J
authors.lastname: Gómez-de-Terreros
authors.affiliation: Pulmonary Section, Virgen del Puerto Hospital, Plasencia, Spain.
authors.forename: María-Ángeles
authors.initials: MÁ
authors.lastname: Sánchez-Quiroga
authors.affiliation: Department of Medicine, Section of Pulmonary and Critical Care, University of Chicago, Chicago, IL.
authors.forename: Babak
authors.initials: B
authors.lastname: Mokhlesi