Are more observational studies being included in Cochrane Reviews?

被引:6
|
作者
Hans Christian Kongsted
Merete Konnerup
机构
[1] University of Copenhagen,Department of Economics
[2] The Campbell Collaboration’s steering group and Trygfonden,undefined
关键词
Systematic reviews; Observational study; Randomized controlled trial;
D O I
10.1186/1756-0500-5-570
中图分类号
学科分类号
摘要
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