共 11 条
[9]
Do certain countries produce only positive results? A systematic review of controlled trials
[J].
CONTROLLED CLINICAL TRIALS,
1998, 19 (02)
:159-166
[10]
Bias in Meta-Analysis Detected by a Simple, Graphical Test[J] . Matthias Egger,George Davey Smith,Martin Schneider,Christoph Minder.BMJ: British Medical Journal . 1997 (7109)