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Table 6 Most prolific countries and the collaborations

From: Global research mapping of substance use disorder and treatment 1971–2017: implications for priority setting

Region Rank Countries Total papers % Total citations Citations per paper Intra- country collaboration % Inter-country collaboration % Distinct countries of collaboration Main collaborator (and number of collaborations)
North America 1 United States 8232 60.2 252,935 30.7 6403 77.8 1829 22.2 96 England (244)
3 Canada 701 5.1 18,020 25.7 362 51.6 339 48.4 63 USA (216)
East Asia And Pacific 4 Australia 682 5 16,143 23.7 300 44.0 382 56.0 63 Wales (152)
9 China 338 2.5 6720 19.9 94 27.8 244 72.2 55 USA (142)
20 Japan 129 0.9 1991 15.4 87 67.4 42 32.6 47 USA (17)
24 Taiwan 107 0.8 1597 14.9 65 60.7 42 39.3 26 USA (22)
27 South Korea 100 0.7 1587 15.9 54 54 46 46 23 USA (31)
28 New Zealand 99 0.7 2250 22.7 53 53.5 46 46.5 16 England (19)
33 Hong Kong 68 0.5 1088 16 1 1.5 67 98.5 43 China (67)
34 Malaysia 66 0.5 1005 15.2 17 25.8 49 74.2 42 USA (31)
39 Singapore 42 0.3 1553 37 16 38.1 26 61.9 30 USA (10)
Europe and Central Asia 2 England 1064 7.8 37,226 35 510 47.9 554 52.1 71 USA (244)
5 Italy 379 2.8 9989 26.4 190 50.1 189 49.9 54 USA (82)
6 Netherlands 379 2.8 9771 25.8 185 48.8 194 51.2 53 USA (85)
7 France 372 2.7 8250 22.2 150 40.3 222 59.7 49 USA (109)
8 Germany 341 2.5 8503 24.9 148 43.4 193 56.6 46 USA (76)
10 Spain 315 2.3 6734 21.4 178 56.5 137 43.5 66 USA (53)
11 Switzerland 240 1.8 6077 25.3 70 29.2 170 70.8 52 USA (96)
12 Sweden 232 1.7 7483 32.3 116 50 116 50 38 USA (37)
14 Wales 197 1.4 6742 34.2 12 6.1 185 93.9 40 Australia (152)
18 Norway 144 1.1 3992 27.7 67 46.5 77 53.5 31 USA (26)
19 Denmark 132 1 4716 35.7 80 60.6 52 39.4 27 USA (19)
21 Georgia 129 0.9 3044 23.6 3 2.3 126 97.7 16 USA (120)
25 Scotland 101 0.7 3135 31 31 30.7 70 69.3 35 England (47)
26 Finland 100 0.7 1981 19.8 47 47 53 53 28 Sweden (17)
29 Belgium 96 0.7 2798 29.2 35 36.5 61 63.5 40 Netherlands (28)
30 Turkey 93 0.7 967 10.4 79 84.9 14 15.1 24 Germany (3)
31 Austria 78 0.6 1974 25.3 43 55.1 35 44.9 24 USA (19)
32 Ireland 75 0.5 1373 18.3 52 69.3 23 30.7 33 England (10)
35 Poland 63 0.5 1263 20.1 44 69.8 19 30.2 45 USA (10)
38 Greece 42 0.3 1312 31.2 21 50 21 50 34 England (9)
40 Portugal 39 0.3 1018 26.1 11 28.2 28 71.8 42 Italy (10)
Latin America and The Caribbean 17 Mexico 178 1.3 6888 38.7 16 9 162 91 43 USA (156)
22 Brazil 127 0.9 2363 18.6 62 48.8 65 51.2 53 USA (30)
Middle East and North Africa 13 Israel 200 1.5 7132 35.7 65 32.5 135 67.5 46 USA (126)
16 Iran 188 1.4 1396 7.4 98 52.1 90 47.9 39 USA (39)
23 Oman 115 0.8 1901 16.5 1 0.9 114 99.1 48 USA (62)
36 Lebanon 53 0.4 2713 51.2 1 1.9 52 98.1 34 USA (50)
41 Jordan 34 0.2 252 7.4 4 11.8 30 88.2 11 USA (26)
South Asia 15 India 195 1.4 3887 19.9 71 36.4 124 63.6 43 USA (109)
Sub-Saharan Africa 37 South Africa 53 0.4 1166 22 25 47.2 28 52.8 27 USA (14)