1. Microbiology Department, IDIBAPS, Hospital Clinı́c, Barcelona1;
2. Instituto Valenciano de Microbiologı́a, Valencia2;
3. Medical Department, GlaxoSmithKline, Tres Cantos, Madrid3;
4. Microbiology Department, Hospital General Universitario Gregorio Marañón, Madrid4; and
5. Microbiology Department, Residencia Marqués de Valdecilla, Santander,5 Spain