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10796 Studies found for: Placebo AND once
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Map Legend
Region Name Number of Studies
World 10,796
Africa [map] 647
Central America [map] 428
East Asia [map] 1,750
Japan 650 [studies]
Europe [map] 3,735
Middle East [map] 738
North America 5,793
Canada [map] 1,621 [studies]
Mexico 612 [studies]
United States [map] 5,329 [studies]
North Asia [map] 962
Pacifica [map] 859
South America [map] 898
South Asia [map] 440
Southeast Asia [map] 521

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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.