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22179 Studies found for: Placebo AND subjects
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Map Legend
Region Name Number of Studies
World 22,179
Africa [map] 656
Central America [map] 506
East Asia [map] 2,510
Japan 842 [studies]
Europe [map] 6,496
Middle East [map] 1,005
North America 12,940
Canada [map] 2,413 [studies]
Mexico 716 [studies]
United States [map] 12,183 [studies]
North Asia [map] 1,218
Pacifica [map] 1,350
South America [map] 1,149
South Asia [map] 504
Southeast Asia [map] 670

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Click on a [studies] link to search within your current results for studies in that region. Use the back button to return to this list and try another region.

Studies with no locations are not included in the counts or on the map.

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