1. Service of Infectious Diseases, Hospital Carlos III, Madrid, Spain.
2. Service of Microbiology, Hospital Xeral, Santiago, Spain.
3. Service of Microbiology, Hospital Vall d'Hebron, Barcelona, Spain.
4. Service of Clinical Analyses, Hospital Universitario, Valencia, Spain.
5. Service of Microbiology, Complejo Hospitalario, Pontevedra, Spain.
6. Service of Microbiology, Hospital de Puerto Real, Cadiz, Spain.
7. Service of Microbiology, Hospital Clínico, Valladoled, Spain.
8. Centro Sanitario Sandoval, Madrid, Spain.
9. Service of Microbiology, Hospital Universitario Lozano Blesa, Zaragoza, Spain.
10. Service of Internal Medicine, Hospital Virgen del Rocéo, CIBER Epidiologia, Seville, Spain.
11. Service of Microbiology, Hospital Universitario Insular, Las Palmas, Spain.
12. Service of Microbiology, Hospital Carlos III, Madrid, Spain.
13. Service of Microbiology, Hospital Virgen de la Salud, Toledo, Spain.
14. Service of Microbiology, Hospital Cristal-Piñor, Orense, Spain.