1. Department of Pneumology, Thorax Institute; Hospital Clinic of Barcelona-August Pi i Sunyer Biomedical Research Institute (IDIBAPS); University of Barcelona (UB)-SGR 911-, Ciber de Enfermedades Respiratorias (Ciberes); Barcelona Spain
2. University of Zagreb School of Medicine, ‘Dr. Fran Mihaljevic’ University Hospital for Infectious Diseases; Zagreb Croatia
3. Respiratory Diseases Unit; Hospital of Sestri Levante; Italy