1. Clinical Microbiology and Infectious Diseases Department, Hospital General Universitario Gregorio Marañón, Madrid, Spain
2. Instituto de Investigación Sanitaria Gregorio Marañón (IiSGM), Madrid, Spain
3. Division of Infectious Diseases, Medicine Department, Massachusetts General Hospital, Boston, Massachusetts, USA
4. Harvard Medical School, Boston, Massachusetts, USA
5. Cardiology Division, Medicine Department, Massachusetts General Hospital, Boston, Massachusetts, USA
6. Department of Medicine, School of Medicine, Universidad Complutense de Madrid, Madrid, Spain
7. CIBER de Enfermedades Respiratorias-CIBERES (CB06/06/0058), Madrid, Spain