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

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

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