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| Methods | See Holmgren 1985 | |
| Participants | ||
| Interventions | ||
| Outcomes | ||
| Notes | Long‐term follow‐up of previously published trial. | |
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Allocation concealment (selection bias) | Unclear risk | B ‐ Unclear |
