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10870 Studies found for: Placebo AND once
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Map Legend
Region Name Number of Studies
World [map] 10,870
North America 5,836
Canada 1,637 [studies]
Alberta 536 [studies]
British Columbia 619 [studies]
Manitoba 284 [studies]
New Brunswick 127 [studies]
Newfoundland and Labrador 154 [studies]
Nova Scotia 216 [studies]
Ontario 1,203 [studies]
Prince Edward Island 27 [studies]
Quebec 908 [studies]
Saskatchewan 147 [studies]

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