1. Hospital de la Santa Creu i Sant Pau, Institut d'Investigació Biomédica Sant Pau (IIB Sant Pau), Universitat Autònoma de Barcelona, Barcelona Respiratory Network (BRN); Pulmonology Department; Sant Antoni Maria Claret 167 Barcelona Spain 08025
2. CIBER Epidemiología y Salud Pública (CIBERESP); Iberoamerican Cochrane Centre, Biomedical Research Institute Sant Pau (IIB Sant Pau); Sant Antoni Maria Claret 167 Pavilion 18 Barcelona Catalunya Spain 08025
3. Hospital de la Santa Creu i Sant Pau; Unit of Bronchoscopy, Respiratory Department; Barcelona Spain
4. McMaster University; Department of Clinical Epidemiology and Biostatistics; 1280 Main Street West. HSC-2C21 Hamilton ON Canada L8S 4K1
5. University of Antioquia, Colombia; Group of Clinical and Experimental Allergy; Medellín Antioquia Colombia
6. CIBER Epidemiología y Salud Pública (CIBERESP); Iberoamerican Cochrane Centre - Biomedical Research Institute Sant Pau (IIB Sant Pau); Sant Antoni Maria Claret 171 - Edifici Casa de Convalescencia Barcelona Catalunya Spain 08041