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| Byline position of authors receiving equal credit | Ane (n = 106) | BJA (n = 59) | A&A (n = 67) | Total (n = 232) |
| USA | 31 | 2 | 18 | 51 |
| Western Europe | 47 | 41 | 20 | 108 |
| Canada | 2 | 3 | 3 | 8 |
| Asia (excluding Japan) | 19 | 12 | 23 | 54 |
| Japan | 7 | 1 | 3 | 11 |
