TY - JOUR T1 - The return of “negative” trials? JF - Canadian Medical Association Journal JO - CMAJ SP - 1392 LP - 1393 VL - 168 IS - 11 AU - Mario L. de Lemos Y1 - 2003/05/27 UR - http://www.cmaj.ca/content/168/11/1392.2.abstract ER -