1. Clinical Microbiology and Infectious Diseases, Hospital General Universitario Gregorio Marañón, Madrid, Spain
2. Instituto de Investigación Sanitaria Hospital Gregorio Marañón, Madrid, Spain
3. Medicine Department, School of Medicine, Universidad Complutense de Madrid, Madrid, Spain
4. CIBER Enfermedades Respiratorias-CIBERES (CB06/06/0058), Madrid, Spain
5. Infectious Diseases Clinic, Department of Medicine, University of Udine and Azienda Sanitaria Universitaria Integrata, Udine, Italy
6. Infectious Diseases Department, Hospital Universitario Ramón y Cajal, Madrid, Spain
7. Unit of Infectious Diseases, Hospital Universitario ′12 de Octubre′, Instituto de Investigación Hospital ′12 de Octubre′ (i+12), Universidad Complutense, Madrid, Spain
8. Clinical Microbiology Department, Hospital Universitario Clinico San Carlos, Madrid, Spain
9. Postsurgical Intensive Care Unit, Hospital General Universitario Gregorio Marañón, Madrid, Spain