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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
Africa 650
Algeria 6 [studies]
Benin 1 [studies]
Botswana 3 [studies]
Burkina Faso 2 [studies]
Cameroon 1 [studies]
Egypt 76 [studies]
Ethiopia 8 [studies]
Gambia 1 [studies]
Ghana 2 [studies]
Guinea-Bissau 1 [studies]
Kenya 12 [studies]
Malawi 7 [studies]
Mali 3 [studies]
Morocco 8 [studies]
Mozambique 4 [studies]
Nigeria 2 [studies]
Rwanda 1 [studies]
Senegal 1 [studies]
South Africa 493 [studies]
Tanzania 14 [studies]
Tunisia 31 [studies]
Uganda 25 [studies]
Zambia 4 [studies]
Zimbabwe 8 [studies]

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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.