[1] Univ Western Australia, Sch Social Sci, 35 Stirling Highway, Crawley, WA 6009, Australia
[2] Perth Childrens Hosp, Wesfarmers Ctr Vaccines & Infect Dis, Telethon Kids Inst, 15 Hosp Ave, Nedlands, WA 6009, Australia
[3] Univ Erfurt, Nordhauser Str 63, D-99089 Erfurt, Germany
[4] Univ Laval, Ctr Rech CHU Quebec, 2400 DEstimauville, Quebec City, PQ G1E 7G9, Canada
[5] Finnish Inst Hlth & Welf THL, Infect Dis Control & Vaccinat, Mannerheimintie 166, Helsinki, Finland
[6] Univ Sherbrooke, Fac Med & Hlth Sci, Dept Pediat, 3001 12e Ave Nord, Sherbrooke, PQ J1H 5N4, Canada
[7] Univ Svizzera Italiana, Fac Commun Sci, Inst Publ Hlth, BeCHANGE Res Grp, Via G Buffi 13, Lugano, Switzerland
[8] Swiss Sch Publ Hlth SSPH, Zurich, Switzerland
[9] Imperial Coll London, Inst Global Hlth Innovat, London, England
[10] Fdn Merieux, Sci Conf & Publ Hlth Initiat, 17 Rue Bourgelat, F-69002 Lyon, France
[11] Sanofi Pasteur, 14 Espace Henry Vallee, F-69007 Lyon, France
[12] UNICEF United Nations Childrens Fund Program Div, UNICEF House,3 United Nations Plaza, New York, NY 10017 USA