TY - JOUR T1 - The “number needed to treat” turns 20 — and continues to be used and misused JF - Canadian Medical Association Journal JO - CMAJ SP - 549 LP - 553 DO - 10.1503/cmaj.080484 VL - 179 IS - 6 AU - Finlay A. McAlister, MD MSc Y1 - 2008/09/09 UR - http://www.cmaj.ca/content/179/6/549.abstract ER -