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198711 Studies found for: Participants

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
Region Name Number of Studies
World 198,711
Africa [map] 8,211
Central America [map] 2,367
East Asia [map] 24,934
Japan 4,597 [studies]
Europe [map] 50,456
Middle East [map] 11,079
North America 93,827
Canada [map] 15,558 [studies]
Greenland 2 [studies]
Mexico 3,285 [studies]
United States [map] 84,063 [studies]
North Asia [map] 5,165
Pacifica [map] 6,741
South America [map] 8,004
South Asia [map] 4,197
Southeast Asia [map] 5,270

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.