[1] Ailsa Hosp, NHS Ayrshire & Arran, Ayr KA6 0BA, Scotland
[2] Lahey Clin Med Ctr, Burlington, MA 01803 USA
[3] Tufts Univ, Sch Med, Boston, MA 02111 USA
[4] Univ Rovira & Virgili, Joan Univ Hosp 23, Tarragona, Spain
[5] Free Univ Brussels, Hop Erasme, B-1070 Brussels, Belgium
[6] Natl Ctr Antimicrobial Infect Control, Copenhagen, Denmark
[7] GH Pitie Salpetriere, AP HP, Paris, France
[8] Karolinska Inst Stockholm, Stockholm, Sweden
[9] Univ Verona, I-37100 Verona, Italy
[10] City Hosp, Berlin, Germany
[11] Attikon Univ Hosp, Athens, Greece
[12] Univ Med Ctr, Utrecht, Netherlands
[13] Istanbul Univ, Istanbul, Turkey
[14] Univ Dundee, Dundee, Scotland