... 3St. Michael's Hospital, University of Toronto, Toronto, Ontario, Canada, 4Institute for Clinical Evaluative Sciences, University of Toronto, Toronto, Ontario, Canada, 5Harvard Humanitarian ... In order for findings to be useful, they should to besimilar to the current situation or provide strong historicalcontext that can assist in determining their relevance to the current context.The ... surveyed and provided historical comparisons. Theinvestigators then selected 30 clusters in each health zoneand visited 20 houses in each cluster in the West and 30 in the East, a total of 19 500 households...