DOI:
10.1055/s-00030576
Revista Brasileira de Ginecologia e Obstetrícia / RBGO Gynecology and Obstetrics
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References
Egger M, Davey Smith G, Schneider M, Minder C.
Bias in meta-analysis detected by a simple, graphical test.
BMJ 1997;
315 (7109): 629-634 . Doi: 10.1136/bmj.315.7109.629
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