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10868 Studies found for: Placebo AND once
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Map Legend
Region Name Number of Studies
World [map] 10,868
South America 906
Argentina 532 [studies]
Bolivia 2 [studies]
Brazil 502 [studies]
Chile 276 [studies]
Colombia 208 [studies]
Ecuador 9 [studies]
Peru 171 [studies]
Uruguay 2 [studies]
Venezuela 10 [studies]

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Studies with multiple locations are included in each region containing locations.