Authors: T A Brennan; L L Leape; N M Laird; L Hebert; A R Localio; A G Lawthers; J P Newhouse; P C Weiler; H H Hiatt Journal: N Engl J Med Date: 1991-02-07 Impact factor: 91.245
Authors: Elena Parmelli; Gerd Flodgren; Scott G Fraser; Nicola Williams; Gregory Rubin; Martin P Eccles Journal: Cochrane Database Syst Rev Date: 2012-08-15