Updates of review
Task	Author
Screening search results	AP, MW,TG
Organising retrieval of papers	AP,TG
Screening retrieved papers against inclusion criteria and appraising risk of bias	AP, MW,TG
Abstracting data from papers	AP, MW
Writing to authors of papers for additional information	AP
Data management for the updated review and data entry	AP
Analysis and interpretation of data	AP, MW
Providing a methodological and clinical perspective	AP, MW
Providing a policy perspective	MW
Writing the update	AP, MW,TG
Providing general advice on the review	AP,MW