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Answer 3

We thought the answer was CAN'T TELL.

Good list of databases, but no expert contacts.
They include the outcome in the search strategy which is quite unusual.
They don't include non-English language studies which could be a big problem.
They include cross-over studies but don't explain how they handled the results of these, particularly with reference to the washout period. They don't describe the process of data extraction at all.