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2.1
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Did the search include an appropriate range of databases/electronic sources for published and unpublished reports?
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Yes/probably yes/probably no/no/no information
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2.2
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Were methods additional to database searching used to identify relevant reports?
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Yes/probably yes/probably no/no/no information
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2.3
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Were the terms and structure of the search strategy likely to retrieve as many eligible studies as possible?
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Yes/probably yes/probably no/no/no information
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2.4
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Were restrictions based on date, publication format, or language appropriate?
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Yes/probably yes/probably no/no/no information
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