Evidence-based medicine: systematic reviews. The Cochrane Collaboration.
J. Arrieta, and N. Qizilbash. Medicina clínica, 107 (15):
581-5(November 1996)2470<m:linebreak></m:linebreak>Comment in: Med Clin (Barc) 1997 Oct 25;109(14):563-4;<m:linebreak></m:linebreak>Metaanàlisi.