RT Journal Article SR Electronic T1 Exaggeration of treatment benefits using the “event-based” number needed to treat JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 669 OP 671 DO 10.1503/cmaj.080018 VO 179 IS 7 A1 Shawn D. Aaron MD A1 Dean A. Fergusson, PhD YR 2008 UL http://www.cmaj.ca/content/179/7/669.abstract