Limits of observational data in determin
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Sharon H. Giordano; Yong-Fang Kuo; Zhigang Duan; Gabriel N. Hortobagyi; Jean Fre
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Article
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2008
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John Wiley and Sons
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English
⚖ 185 KB
## Abstract ## BACKGROUND. Observational data are used increasingly to assess the effectiveness of therapies. However, selection biases are likely to have an impact on results and threaten the validity of these studies. ## METHODS. The primary objective of the current study was to explore the ef