[1] Univ Waterloo, Sch Planning, Waterloo, ON, Canada
[2] Univ Western Ontario, Fac Social Sci, Dept Geog, Human Environm Anal Lab, London, ON, Canada
[3] Univ Western Ontario, Dept Geog & Environm, London, ON, Canada
[4] Childrens Hlth Res Inst, London, ON, Canada
[5] Lawson Hlth Res Inst, London, ON, Canada
[6] Univ Western Ontario, Dept Paediat, London, ON, Canada
[7] Univ Western Ontario, Dept Epidemiol & Biostat, London, ON, Canada
[8] Univ Western Ontario, Sch Hlth Studies, London, ON, Canada
[9] Western Univ, 1151 Richmond St, London, ON N6A 5C2, Canada