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m →Empirical evidence that randomization makes a difference: Journal cites, added 1 PMC using AWB (12156) |
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| ___location = Chicago, Illinois, USA
| year = 2013
| url =
| doi = 10.1145/2487575.2488217
}}</ref>
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| pages = 153–155
| year = 2004
| url =
| doi = 10.1136/qshc.2003.009480
| pmid=15069225
|