Original protocol and review
Task	Author
Conceiving the review	MW, BF
Designing the review	MW, BF, AP
Coordinating the review	MW
Data collection for the review	BF, AP
Developing search strategy	MW, BF, AP
Undertaking searches	BF, AP
Screening search results	BF, AP
Organising retrieval of papers	BF, AP
Screening retrieved papers against inclusion criteria	BF, AP
Appraising quality of papers	BF, AP
Abstracting data from papers	BF, AP
Writing to authors of papers for additional information	BF, AP
Providing additional data about papers	MW, BF, AP
Obtaining and screening data on unpublished studies	BF, AP
Data management for the review	BF, AP
Entering data into RevMan	BF, AP
Analysis of data	BF, AP
Interpretation of data	MW, BF, AP
Providing a methodological perspective	MW, BF, AP
Providing a clinical perspective	MW, BF, AP
Providing a policy perspective	MW
Writing the review	MW, BF, AP
Providing general advice on the review	MW