1 Respiratory Department, Thorax Clinic Institute, Hospital Universitari Germans Trias i Pujol, Badalona, Barcelona, Spain; Department of Medicine, Universitat Autònoma de Barcelona, Barcelona, Spain; Ciber de Enfermedades Respiratorias (CIBERES), Spain. Electronic address: fandreo@separ.es.
2 Respiratory Department, Thorax Clinic Institute, Hospital Universitari Germans Trias i Pujol, Badalona, Barcelona, Spain; Chest Department, Tanta University, Egypt.
3 Respiratory Department, Thorax Clinic Institute, Hospital Universitari Germans Trias i Pujol, Badalona, Barcelona, Spain.
4 Respiratory Department, Thorax Clinic Institute, Hospital Universitari Germans Trias i Pujol, Badalona, Barcelona, Spain; Department of Medicine, Universitat Autònoma de Barcelona, Barcelona, Spain; Ciber de Enfermedades Respiratorias (CIBERES), Spain.