Working…
ClinicalTrials.gov
ClinicalTrials.gov Menu
Open or close the search fields display
51588 Studies found for: questionnaire

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 51,588
Africa [map] 1,288
Central America [map] 575
East Asia [map] 4,547
Japan 925 [studies]
Europe [map] 18,382
Middle East [map] 2,350
North America 22,190
Canada [map] 4,678 [studies]
Greenland 1 [studies]
Mexico 866 [studies]
United States [map] 19,016 [studies]
North Asia [map] 1,345
Pacifica [map] 1,543
South America [map] 2,401
South Asia [map] 728
Southeast Asia [map] 1,050
Hints:

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.