| Develop and run the search strategy | JD, KZ, KG |
| Obtain copies of trials | JD, KZ |
| Select which trials to include | JD, KZ, KG |
| Extract data from trials (2 people) | JD, KZ |
| Enter data into RevMan | JD, KZ |
| Carry out the analyses | JD, KZ |
| Interpret the analyses | All authors |
| Draft the final review | All authors |
| Update the review | All authors |
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