Version October 2024
| Country | Incidence | Reference |
| Finland | 9.2/100,000 | Laaksonen, 1966 |
| Finland | 19.6/100,000 | Kunnamo, 1986 |
| Sweden | 10.9/100,000 | Gare, 1992 |
| Canada | 5.3/100,000 | Oen, 1995 |
| UK | 10.0/100,000 | Symmons, 1996 |
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