Hierarchy of Evidence: Where Observational Studies Fit in and Why We Need Them.
Hoppe, Daniel J.; Schemitsch, Emil H.; Morshed, Saam; Tornetta, III, Paul; Bhandari, Mohit; Journal of Bone & Joint Surgery, American Volume, 2009, vol. 91-A, p 2, ISSN 00219355. ISBN 15351386.

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