1. Epidemiology Department, Directorate General of Public Health, Regional Ministry of Health of Madrid, 28002 Madrid, Spain
2. Department of Preventive Medicine, University Hospital 12 de Octubre, 28041 Madrid, Spain
3. CIBER of Respiratory Diseases (CIBERES), 28029 Madrid, Spain
4. Departamento de Epidemiología y Salud Pública, Epidemiología de las Enfermedades Infecciosas, Universidad de Alcalá, Alcalá de Henares, 28881 Madrid, Spain
5. Clinical Microbiology Unit, Public Health Regional Laboratory of the Community of Madrid, Directorate General of Public Health, Regional Ministry of Health of Madrid, 28055 Madrid, Spain
6. Spanish Pneumococcal Reference Laboratory, National Center for Microbiology, Instituto de Salud Carlos III, 28222 Madrid, Spain
7. CIBER of Epidemiology and Public Health (CIBERESP), 28029 Madrid, Spain