PT - JOURNAL ARTICLE AU - Finlay A. McAlister, MD MSc TI - The “number needed to treat” turns 20 — and continues to be used and misused AID - 10.1503/cmaj.080484 DP - 2008 Sep 09 TA - Canadian Medical Association Journal PG - 549--553 VI - 179 IP - 6 4099 - http://www.cmaj.ca/content/179/6/549.short 4100 - http://www.cmaj.ca/content/179/6/549.full SO - CMAJ2008 Sep 09; 179