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Country of affiliation of the first authors (N=543).
| Country of affiliationa | Number of articles, n (%) |
| USA | 237 (43.6) |
| UK | 52 (9.6) |
| Italy | 44 (8.1) |
| India | 25 (4.6) |
| Canada | 25 (4.6) |
| Australia | 16 (2.9) |
| France | 15 (2.8) |
| China | 15 (2.8) |
| Spain | 13 (2.4) |
| Singapore | 11 (2.0) |
aThe first author’s place of work
