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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
Central America 431
Bahamas 1 [studies]
Belize 7 [studies]
Costa Rica 24 [studies]
Cuba 1 [studies]
Dominican Republic 25 [studies]
El Salvador 5 [studies]
Guatemala 57 [studies]
Haiti 3 [studies]
Honduras 4 [studies]
Jamaica 3 [studies]
Panama 21 [studies]
Puerto Rico 333 [studies]

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