[1] Univ Hosp Crosshouse, Dept Microbiol, Kilmarnock KA2 0BE, Scotland
[2] Univ Chicago, Dept Med, Chicago, IL 60637 USA
[3] Univ Chicago, Dept Paediat, Chicago, IL 60637 USA
[4] Univ Chicago, Dept Publ Hlth Sci, Chicago, IL 60637 USA
[5] Univ Mutua Terrassa, Dept Med, Plaza Dr Robert 5, Barcelona 08221, Spain
[6] Concord Hosp, Dept Microbiol & Infect Dis, Sydney, NSW 2139, Australia
[7] Univ Firenze, Dept Hlth Sci, Clin Pharmacol & Oncol Sect, Florence, Italy
[8] Univ Milan, Dept Oncol & Oncohaematol, Via Vanvitelli 32, I-20129 Milan, Italy
[9] Pontchaillou Univ Hosp, Infect Dis & Intens Care Unit, F-35033 Rennes, France
[10] Aberdeen Royal Infirm, Dept Microbiol, Aberdeen AB25 2ZN, Scotland