[1] McGill Univ, Jewish Gen Hosp, Div Infect Dis, Montreal, PQ H3T 1E2, Canada
[2] Jewish Gen Hosp, Lady Davis Inst Med Res, Ctr Clin Epidemiol, Montreal, PQ H3T 1E2, Canada
[3] McGill Univ, Dept Epidemiol Biostat & Occupat Hlth, Montreal, PQ H3A 1A2, Canada
[4] Univ Sherbrooke, Dept Microbiol & Infect Dis, Sherbrooke, PQ J1H 5N4, Canada
[5] Odense Univ Hosp, Bispebjerg & Frederiksberg Hosp, Parker Inst, Musculoskeletal Stat Unit, DK-2000 Odense, Denmark
[6] Odense Univ Hosp, Dept Rheumatol, DK-2000 Odense, Denmark
[7] Univ Sydney, NHMRC Clin Trials Ctr, Sydney, NSW 1450, Australia
[8] Univ Leicester, Dept Infect Immun & Inflammat, Leicester LE1 7RH, Leics, England
[9] Univ Freiburg, Med Ctr, Cochrane Germany Fdn, Inst Evidence Med, D-79110 Freiburg, Germany
[10] European Ctr Dis Prevent & Control, S-16973 Solna, Sweden
[11] Natl Inst Publ Hlth & Environm RIVM, Ctr Infect Dis Control, NL-3720 BA Bilthoven, Netherlands
[12] Bruyere Res Inst, CT Lamont Primary Hlth Care Res Ctr, Ottawa, ON K1N 5C8, Canada
[13] Univ Ottawa, Ctr Global Hlth, Ottawa, ON K1N 5C8, Canada
[14] Univ Brescia, Div Infect Dis, I-255123 Brescia, Italy