TY - JOUR T1 - NNT for studies with long-term follow-up JF - Canadian Medical Association Journal JO - CMAJ SP - 613 LP - 613 DO - 10.1503/cmaj.1041426 VL - 172 IS - 5 AU - Mario L. de Lemos Y1 - 2005/03/01 UR - http://www.cmaj.ca/content/172/5/613.1.abstract N2 - ER -