Comparison of evidence on harms of medical interventions in randomized and nonrandomized studies.
Papanikolaou PN; Christidi GD; Ioannidis JP; CMAJ: Canadian Medical Association Journal = Journal De L'association Medicale Canadienne, 2006, vol. 174, issue 5, p 635, ISSN 14882329. ISBN 14882329.

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