Controversy over "contradiction": Should randomized trials always trump observational studies?

Astrid EFletcher; (2009) Controversy over "contradiction": Should randomized trials always trump observational studies? American journal of ophthalmology, 147 (3). pp. 384-386. ISSN 0002-9394 DOI: 10.1016/j.ajo.2008.04.024
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ISI 263659000003

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