[1] GlaxoSmithKline, Dept Med, Madrid 28760, Spain
[2] Hosp St Joan Deu, Dept Microbiol, Barcelona, Spain
[3] Hosp La Paz, Dept Microbiol, Madrid, Spain
[4] Hosp Virgen Macarena, Dept Microbiol, Seville, Spain
[5] Hosp Gen Univ Gregorio Maranon, Dept Microbiol, Madrid, Spain
[6] Inst Valenciano Microbiol, Dept Microbiol, Sch Med, Valencia, Spain