Help guide our efforts to modernize
Send us your comments by March 14, 2020. Menu
Open or close the search fields display
6772 Studies found for: zero

A similar map is available for all studies in

Click on the map below to show a more detailed map (when available) or search for studies (when map not available).

Map Legend
Region Name Number of Studies
World [map] 6,772
Europe 2,008
Austria 103 [studies]
Belgium 409 [studies]
Bosnia and Herzegovina 2 [studies]
Bulgaria 74 [studies]
Croatia 27 [studies]
Czech Republic 53 [studies]
Denmark 138 [studies]
Estonia 34 [studies]
Finland 64 [studies]
France 384 [studies]
Germany 593 [studies]
Greece 65 [studies]
Hungary 149 [studies]
Iceland 4 [studies]
Ireland 34 [studies]
Italy 330 [studies]
Latvia 36 [studies]
Lithuania 35 [studies]
Luxembourg 1 [studies]
Netherlands 262 [studies]
Norway 78 [studies]
Poland 226 [studies]
Portugal 65 [studies]
Romania 97 [studies]
Serbia 38 [studies]
Slovakia 71 [studies]
Slovenia 16 [studies]
Spain 399 [studies]
Sweden 129 [studies]
Switzerland 110 [studies]
United Kingdom 667 [studies]

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.