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| Methods | Crossover design; 1st phase 3 weeks, 2nd phase 2 weeks. | |
| Participants | ||
| Interventions | Ipratropium bromide 80µg and salbutamol 400µg; both interventions q.i.d. | |
| Outcomes | ||
| Notes | This comparison not analysed, so details not extracted. | |
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Allocation concealment (selection bias) | Unclear risk | Information not available (Cochrane Grade B) |
