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*<b>[http://www.kidney.de/mlpefetch.php?search=15313996 Tips for learners of evidence-based medicine: 1 Relative risk reduction, absolute risk reduction and number needed to treat ]</b> CMAJ 2004; 171(4) ; 353-8 Barratt A; Wyer PC; Hatala R; McGinn T; Dans AL; Keitz S; Moyer V; For GG
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