Stefan Gerber, Deborah Tallon, Sven Trelle, Martin Schneider, Peter Jüni, Matthias Egger,
Bibliographic study showed improving methodology of meta-analyses published in leading journals 1993–2002 Journal of Clinical Epidemiology. ,vol. 60, pp. 773- 780 ,(2007) ,
10.1016/J.JCLINEPI.2006.10.022