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19719 Studies found for: survey

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Map Legend
Region Name Number of Studies
World 19,719
Africa [map] 601
Central America [map] 187
East Asia [map] 1,494
Japan 329 [studies]
Europe [map] 3,877
Middle East [map] 649
North America 11,331
Canada [map] 1,365 [studies]
Mexico 247 [studies]
United States [map] 10,281 [studies]
North Asia [map] 356
Pacifica [map] 344
South America [map] 525
South Asia [map] 266
Southeast Asia [map] 336

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Studies with multiple locations are included in each region containing locations.