| Contribution | Author |
| Draft the review | All authors |
| Develop and run the search strategy | JD, SYK, and Cochrane staff |
| Obtain copies of trials | JD, SYK, DC |
| Select which trials to include (3 people) | JD, SYK, DC, with advice from all authors as needed |
| Extract data from trials (3 people) | JD, SYK, DC |
| Enter data into Revview Manager 5 | JD, SYK, DC |
| Carry out the analysis | JD, SYK, DC |
| Interpret the analysis | All authors |
| Draft the final review | All authors |
| Update the review | All authors |
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