[1] Univ Witwatersrand, MRC, Resp & Meningeal Pathogens Res Unit, ZA-2050 Johannesburg, South Africa
[2] Univ Witwatersrand, Dept Sci & Technol, Natl Res Fdn, ZA-2050 Johannesburg, South Africa
[3] Univ Laval, Dept Social & Prevent Med, Quebec City, PQ, Canada
[4] Vanderbilt Univ, Sch Med, Dept Prevent Med, Nashville, TN 37212 USA
[5] Univ Queensland, Royal Childrens Hosp, Queensland Childrens Med Res Inst, Brisbane, Qld, Australia
[6] Univ Toronto, Mississauga, ON L5L 1C6, Canada
[7] Credit Valley Hosp, Mississauga, ON, Canada
[8] Chiba Univ, Grad Sch Med, Dept Pediat, Chiba, Japan
[9] Natl Taiwan Univ Hosp, Taipei, Taiwan
[10] Univ Fed Bahia, Sch Med, Dept Pediat, Salvador, BA, Brazil
[11] Natl Inst Hlth & Welf, Dept Vaccines & Immune Protect, Helsinki, Finland
[12] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Int Hlth, Baltimore, MD USA
[13] Univ Libre Bruxelles, Pediat Infect Dis,Infect Control & Epidemiol Unit, Brussels, Belgium