Table 1. Cluster Characteristics.
| Characteristics | No. |
|---|---|
| Overall | 25 |
| Province in Canada | |
| Quebec | 14 |
| Ontario | 9 |
| Manitoba | 1 |
| New Brunswick | 1 |
| Total cluster size, median (IQR), patients | 854 (594-1037) |
| Cluster-period size, median (IQR), patients | 63 (43-85) |
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