| | Cluster number | Items (number of country coauthorships) |
| Cluster # 1 (red)
21 items | Belgium (31), Burkina Faso (94), Cameroon (53), Denmark (61), Ethiopia (47), France (182), Gambia (67), Ghana (79), Italy (29), Kenya (112), Madagascar (45), Malawi (47), Mali (76), Netherlands (58), Nigeria (80), Senegal (42), South Africa (47), Sudan (69), Tanzania (121), Uganda (63), United Kingdom (518). | Cluster # 2 (green)
13 items | Brazil (35), China (33), Egypt (17), Iran (8), Japan (66), Malaysia (10), Pakistan (13), Papua New Guinea (53), Portugal (77), Spain (27), Sweden (125), USA (529), Yemen (10). | Cluster # 3 (blue)
10 items | Austria (32), Bangladesh (60), Cambodia (203), Congo (70), Laos (76), Myanmar (56), Singapore (56), Switzerland (158), Thailand (312), Vietnam (69). | Cluster # 4
(yellowish green)
7 items | Australia (197), Canada (47), Colombia (15), Germany (109), India (62), Indonesia (86), Israel (16). |
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