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Statistics of literature publications in different countries (N=41).
| Country | Number of literatures, n (%) |
| Australia | 1 (2) |
| Bangladesh | 1 (2) |
| Canada | 2 (5) |
| Indonesia | 1 (2) |
| Israel | 1 (2) |
| Italy | 2 (5) |
| Korea | 1 (2) |
| Netherlands | 1 (2) |
| Norway | 3 (7) |
| Switzerland | 1 (2) |
| United Kingdom | 8 (20) |
| United States | 19 (46) |
