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51588 Studies found for: questionnaire

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Map Legend
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

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