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ClinicalTrials.gov
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1142 Studies found for: subjects AND Double-blind AND Petersburg

A similar map is available for all studies in ClinicalTrials.gov

Click on the map below to show a more detailed map (when available) or search for studies (when map not available).

Map Legend
Source:https://ClinicalTrials.gov
Region Name Number of Studies
World 1,142
Africa [map] 283
Central America [map] 153
East Asia [map] 437
Japan 194 [studies]
Europe [map] 851
Middle East [map] 345
North America 998
Canada [map] 514 [studies]
Mexico 346 [studies]
United States [map] 958 [studies]
North Asia [map] 854
Pacifica [map] 381
South America [map] 449
South Asia [map] 162
Southeast Asia [map] 233
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Click on a [map] link to show a map of that region.

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.