[1] Karolinska Inst, Ctr Infect Med, Karolinska Univ Hosp Huddinge, S-141866 Stockholm, Sweden
[2] Univ Hosp Orebro, Dept Urol, Orebro, Sweden
[3] Mt Sinai Hosp, Dept Microbiol, Toronto, ON M5G 1X5, Canada
[4] Ontario Agcy Hlth Protect & Promot, Toronto, ON, Canada