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| Study ID | Intervention before | Intervention after | Control before | Control after | Rate ratio (95% CI) |
| Denmark | 0 | 1 | 1 | 0 | Undefined |
| GST‐Moabit | 7 | 3 | 12 | 7 | 0.73 (0.14 to 3.80) |
| GST‐Borgentreich | 0 | 0 | 0 | 0 | Undefined |
| GST‐Buxtehude | 0 | 0 | 0 | 1 | Undefined |
| GST‐Esslingen | 3 | 0 | 3 | 1 | Undefined |
| GST‐ Ingolstadt | 0 | 0 | 0 | 2 | Undefined |
| GST‐Mainz | 1 | 0 | 0 | 0 | Undefined |
| Sydney‐Canterbury | 1 | 0 | 2 | 1 | Undefined |
| Sydney‐Willoughby | 0 | 2 | 1 | 0 | Undefined |
