1. Department of Clinical Epidemiology and Public Health, Hospital de la Santa Creu i Sant Pau, Biomedical Research Institute Sant Pau (IIB Sant Pau), Barcelona
2. Universitat Autònoma de Barcelona, Bellaterra
3. Ciber de Epidemiologia y Salud Pública (CIBERESP)
4. Department of Pneumology, Hospital de la Santa Creu i Sant Pau, Biomedical Research Institute Sant Pau (IIB Sant Pau), Barcelona
5. Medical Oncology Department, Biomedical Research Institute Sant Pau (IIB Sant Pau), Barcelona, Spain