DOI:
10.1055/s-00000022
Das Gesundheitswesen
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References
Hoppe DJ, Schemitsch EH, Morshed S, Tornetta 3rd P, Bhandari M.
Hierarchy of evidence: where observational studies fit in and why we need them.
J Bone Joint Surg Am 2009; May
91 (Suppl. 03) 2-9
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