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. 2006 Jun 15;3(3):A76.

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Map of the St. Louis, Mo, study area. — Unadjusted geographic clustering of fast food restaurants in the St Louis, Mo, study area. The ratio of observed to expected number of restaurants in Cluster 1 is 0.4 (P = .001); Cluster 2, 3.4 (P = .001); Cluster 3, 3.2 (P = .02); Cluster 4, 12.0 (P = .03).