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Best practice in systematic reviews: the importance of protocols and registration.
PLoS Med 8(2):e1001009 (2011) PMID 21364968
DOI: 10.1371/journal.pmed.1001009
Version: za2963e q8zac q8zb2 q8zc9 q8zde q8zee q8zf6 q8zg9
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