1 Pulmonology Department, Hospital Clinic of Barcelona, University of Barcelona, Barcelona, Spain; Faculty of Health Sciences, Continental University, Huancayo, Peru. Electronic address: catiacilloniz@yahoo.com.
2 Pulmonology Department, Hospital Clinic of Barcelona, University of Barcelona, Barcelona, Spain; CIBER de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III, Madrid, Spain. Electronic address: atorres@clinic.cat.