1. Department of Orthopaedic Surgery and Traumatology, Hospital General Universitario Gregorio Marañón, Madrid, Spain
2. Department of Clinical Microbiology and Infectious Diseases, Hospital General Universitario Gregorio Marañón, Madrid, Spain
3. Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain
4. School of Biology, Universidad Complutense de Madrid, Madrid, Spain
5. School of Medicine, Universidad Complutense de Madrid, Madrid, Spain
6. CIBER Enfermedades Respiratorias-CIBERES (CB06/06/0058), Madrid, Spain