Name Sites Samples
Slovakia 40 70
Slovenia 10 38
Spain 389 1382
Sweden 265 1419
Switzerland 143 685
Tanzania 22 191
Turkey 10 80
Turkmenistan 1 2
Uganda 10 63
Ukraine 100 248
United Kingdom 1202 5372
United States 6262 23282
Uruguay 9 40
Ă…land Islands 1 9