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6266 Studies found for: zero
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Map Legend
Region Name Number of Studies
World 6,266
Africa [map] 202
Central America [map] 61
East Asia [map] 725
Japan 244 [studies]
Europe [map] 1,874
Middle East [map] 202
North America 3,100
Canada [map] 532 [studies]
Mexico 95 [studies]
United States [map] 2,835 [studies]
North Asia [map] 181
Pacifica [map] 293
South America [map] 311
South Asia [map] 86
Southeast Asia [map] 181

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