[1] Harvard Univ, Sch Med, Dept Pediat, Boston, MA 02115 USA
[2] Harvard Univ, MIT, Div Hlth Sci & Technol, Childrens Hosp,Informat Program, Boston, MA 02115 USA
[3] Univ British Columbia, Fac Land & Food Syst, Dept Food Nutr & Hlth, Div Int Nutr, Vancouver, BC V5Z 1M9, Canada
[4] Univ Ottawa, Ottawa Hosp Res Inst, Ottawa, ON, Canada
[5] Simon Fraser Univ, Fac Hlth Sci, Burnaby, BC V5A 1S6, Canada
[6] St Pauls Hosp, British Columbia Ctr Excellence HIV AIDS, Vancouver, BC V6Z 1Y6, Canada
[7] St Michaels Hosp, Li Ka Shing Knowledge Inst, Toronto, ON M5B 1W8, Canada
[8] Univ Oxford, Dept Zool, Spatial Ecol & Epidemiol Grp, Oxford OX1 3PS, England
[9] NIH, Fogarty Int Ctr, Bethesda, MD 20892 USA
[10] Univ Southampton, Dept Geog & Environm, Southampton, Hants, England
[11] Flowminder Fdn, Stockholm, Sweden