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18520 Studies found for: for AND survey

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Map Legend
Region Name Number of Studies
World 18,520
Africa [map] 560
Central America [map] 182
East Asia [map] 1,377
Japan 301 [studies]
Europe [map] 3,596
Middle East [map] 589
North America 10,895
Canada [map] 1,335 [studies]
Mexico 235 [studies]
United States [map] 9,865 [studies]
North Asia [map] 350
Pacifica [map] 333
South America [map] 480
South Asia [map] 264
Southeast Asia [map] 317

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